Open Source Software's:

It's become a annual tradition at Datamation to publish an complete roundup of all the open source projects we've featured throughout the year. This year's update includes a vast trove of open source software: 1,343 different projects, from 138 different categories, including two brand new categories.

This year's open source list has quite a few new additions related to cloud computing, the Internet of Things (IoT) and artificial intelligence (AI). It also has quite a few new projects related to marketing software.

Please note that this is not a ranking. The projects are organized into categories and then listed alphabetically within the categories.

As always, if you know of additional open source software that you'd like to see us cover in future lists, feel free to note them in the Comments section below.

Click here for the complete List  | Download the authoritative guide

Source: https://www.datamation.com/open-source/open-source-software-list-ultimate-list-1.html

1. The Accessibility Project

Launched in 2013, this site aims to provide information on making other websites accessible to people with a variety of impairments, particularly those who are blind. You can read the content at the link above; if you'd like to contribute, visit the project's GitHub page. Operating System: OS Independent

2. Edoceo Imperium

This web-based accounting package was created with small and medium-sized businesses (SMBs) in mind. It includes CRM, work order and invoice capabilities as well as standard accounting features. Check out the online demo to see it in action. Operating System: OS Independent

3. FrontAccounting

Another web-based accounting option for SMBs, FrontAccounting boasts inventory tracking and manufacturing management abilities. It's been downloaded more than 200,000 times. Operating System: OS Independent

4. GnuCash

GnuCash combines personal finance software with small business accounting software, which some small business owners find helpful. It can track investments, create graphs, import financial data, set up scheduled transactions and perform standard double-entry accounting. Operating System: Windows, Linux, OS X

5. LedgerSMB

LedgerSMB combines ERP and accounting capabilities in a single package, and it also includes a flexible development framework for extending its features. It has been downloaded more than 86,000 times since 2006. Operating System: Windows, Linux, OS X

6. TurboCASH

Used by more than 80,000 businesses, TurboCASH is a flexible accounting package that compares favorably with QuickBooks and Sage. It was created in the UK but also has a chart of accounts and currency features designed for U.S. businesses. Operating System: Windows

8. ASSP

ASSP claims to be "the absolute best SPAM fighting weapon that the world has ever known!" It offers easy, browser-based setup and works with most mail servers. Operating System: OS Independent.

9. MailScanner

Downloaded more than 1.3 million times, MailScanner is based on SpamAssassin and works with anti-virus software like ClamAV to protect mail servers at companies or ISPs. Support is available through third-party companies. Operating System: OS Independent.

10. Scrollout F1

This full-featured mail security solution incorporates anti-spam, anti-virus and other capabilities with an interface that the project creators say is as easy to use as a car radio. Paid support is available. Operating System: Windows, Linux.

11. SpamAssassin

This Apache project claims to be the "#1 Enterprise Open-Source Spam Filter." It uses a wide variety of methods to identify and block spam, and it works with nearly all mail servers. Operating System: primarily Linux and OS X, although Windows versions are available.

12. SpamBayes

SpamBayes uses statistical algorithms to calculate the probability that an incoming message is spam, and it adapts over time as spammers change their methods. It's available as a plug-in for many popular email services and clients, including Outlook, Thunderbird and others. Operating System: OS Independent.

Anti-Virus/Anti-Malware

13. ClamAV

One of the most popular open source security applications, ClamAV has been incorporated into many different products and has been called "the de facto standard for mail gateway scanning." The core program works on UNIX-based systems, but the website also offers information on Immunet, a ClamAV-based Windows solution that is available in both free and paid versions. Operating System: Linux, but front-ends and additional versions are available for other OSes.

14. ClamTk

This variation on ClamAV adds an easy-to-use GUI to the popular anti-virus engine. Now ten years old, this is a mature project that is included in many Linux distributions. Operating System: Linux.

15. ClamWin Free Antivirus

This Windows-based version of ClamAV boasts more than 600,000 users. It offers a scanning scheduler, integration with Windows Explorer and Outlook, automatic downloads of the updated malware database and support for Windows 7 and 8. Operating System: Windows.

16. Caffe

The brainchild of a UC Berkeley PhD candidate, Caffe is a deep learning framework based on expressive architecture and extensible code. It's claim to fame is its speed, which makes it popular with both researchers and enterprise users. According to its website, it can process more than 60 million images in a single day using just one NVIDIA K40 GPU. It is managed by the Berkeley Vision and Learning Center (BVLC), and companies like NVIDIA and Amazon have made grants to support its development.

17. CNTK

Short for Computational Network Toolkit, CNTK is one of Microsoft's open source artificial intelligence tools. It boasts outstanding performance whether it is running on a system with only CPUs, a single GPU, multiple GPUs or multiple machines with multiple GPUs. Microsoft has primarily utilized it for research into speech recognition, but it is also useful for applications like machine translation, image recognition, image captioning, text processing, language understanding and language modeling.

18. Deeplearning4j

Deeplearning4j is an open source deep learning library for the Java Virtual Machine (JVM). It runs in distributed environments and integrates with both Hadoop and Apache Spark. It makes it possible to configure deep neural networks, and it's compatible with Java, Scala and other JVM languages.

The project is managed by a commercial company called Skymind, which offers paid support, training and an enterprise distribution of Deeplearning4j.

19. Distributed Machine Learning Toolkit

Like CNTK, the Distributed Machine Learning Toolkit (DMTK) is one of Microsoft's open source artificial intelligence tools. Designed for use in big data applications, it aims to make it faster to train AI systems. It consists of three key components: the DMTK framework, the LightLDA topic model algorithm, and the Distributed (Multisense) Word Embedding algorithm. As proof of DMTK's speed, Microsoft says that on an eight-cluster machine, it can "train a topic model with 1 million topics and a 10-million-word vocabulary (for a total of 10 trillion parameters), on a document collection with over 100-billion tokens," a feat that is unparalleled by other tools.

20. H2O

Focused more on enterprise uses for AI than on research, H2O has large companies like Capital One, Cisco, Nielsen Catalina, PayPal and Transamerica among its users. It claims to make is possible for anyone to use the power of machine learning and predictive analytics to solve business problems. It can be used for predictive modeling, risk and fraud analysis, insurance analytics, advertising technology, healthcare and customer intelligence.

It comes in two open source versions: standard H2O and Sparkling Water, which is integrated with Apache Spark. Paid enterprise support is also available.

21. NuPIC

Managed by a company called Numenta, NuPIC is an open source artificial intelligence project based on a theory called Hierarchical Temporal Memory, or HTM. Essentially, HTM is an attempt to create a computer system modeled after the human neocortex. The goal is to create machines that "approach or exceed human level performance for many cognitive tasks."

In addition to the open source license, Numenta also offers NuPic under a commercial license, and it also offers licenses on the patents that underlie the technology.

22. OpenCyc

Developed by a company called Cycorp, OpenCyc provides access to the Cyc knowledge base and commonsense reasoning engine. It includes more than 239,000 terms, about 2,093,000 triples, and about 69,000 owl:sameAs links to external semantic data namespaces. It is useful for rich domain modeling, semantic data integration, text understanding, domain-specific expert systems and game AIs. The company also offers two other versions of Cyc: one for researchers that is free but not open source and one for enterprise use that requires a fee.

23. OpenNN

Designed for researchers and developers with advanced understanding of artificial intelligence, OpenNN is a C++ programming library for implementing neural networks. Its key features include deep architectures and fast performance. Extensive documentation is available on the website, including an introductory tutorial that explains the basics of neural networks. Paid support for OpenNNis available through Artelnics, a Spain-based firm that specializes in predictive analytics.

24. SystemML

First developed by IBM, SystemML is now an Apache big data project. It offers a highly-scalable platform that can implement high-level math and algorithms written in R or a Python-like syntax. Enterprises are already using it to track customer service on auto repairs, to direct airport traffic and to link social media data with banking customers. It can run on top of Spark or Hadoop.

25. TensorFlow

TensorFlow is one of Google's open source artificial intelligence tools. It offers a library for numerical computation using data flow graphs. It can run on a wide variety of different systems with single- or multi-CPUs and GPUs and even runs on mobile devices. It boasts deep flexibility, true portability, automatic differential capabilities and support for Python and C++. The website includes a very extensive list of tutorials and how-tos for developers or researchers interested in using or extending its capabilities.

26. Torch

Torch describes itself as "a scientific computing framework with wide support for machine learning algorithms that puts GPUs first." The emphasis here is on flexibility and speed. In addition, it's fairly easy to use with packages for machine learning, computer vision, signal processing, parallel processing, image, video, audio and networking. It relies on a scripting language called LuaJIT that is based on Lua.

Astronomy

27. Celestia

Travel virtually to anywhere in the known universe at any time with Celestia. It displays hundreds of thousands of celestial bodies as they would appear in the night skies. Operating System: Windows, Linux, OS X.

28. KStars

Similar to Stellarium, KStars lets users view "up to 100 million stars, 13,000 deep-sky objects, all 8 planets, the sun and moon, and thousands of comets and asteroids." It also includes a number of tools helpful for amateur astronomers, such as an observation list, an FOV editor, a sky calendar, supernova alerts and a glossary of technical terms. (Note that in order to use KStars on Windows, you'll have to download KDE for Windows.) Operating System: Windows, Linux

29. Stellarium

Another option for budding astronomers, this one confines the point of view to planet earth rather than allowing users to zoom throughout the universe, but it is so accurate that it is used by many planetariums. Operating System: Windows, Linux, OS X.

30. Amarok

Amarok invites users to rediscover their music. It integrates with a variety of Web services and includes features like dynamic playlists, collection management, bookmarking, file tracking and import from other music databases, including iTunes. Operating System: Windows, Linux, OS X, iOS.

31. Ardour

Designed for use by professional audio engineers, musicians, soundtrack editors and composers, Ardour is a complete audio recording, mixing and editing suite. Key features include support for most hardware, flexible recording, unlimited multichannel tracks, unlimited undo/redo and much more. Operating System: Linux, OS X

32. aTunes

This Java-based music player and manager displays complete information—including lyrics—for the song currently playing. It's a good option for users with particularly large music collections. Operating System: OS Independent

33. Audacious

Unlike some audio players, Audacious doesn't use a lot of system resources, so it doesn't degrade system performance when you're using your PC for other tasks as well as listening to music. The latest update offers improved playlist shuffling, easier recording of Internet streams and a better equalizer interface. Operating System: Windows, Linux.

34. Audacity

A perennial favorite among Linux desktop users, Audacity gets hundreds of thousands of downloads per month. It was updated in July with new scrubbing and seeking features, preset effects and improved plug-in installation. Operating System: Windows, Linux, OS X

35. CDex

Downloaded more than 60 million times, CDex is a simple, handy tool for converting CDs to data files. It supports multiple file formats, including WAV, MP3, FLAC, AAC, WMA and OGG. Operating System: Windows.

36. Cdrtools

This suite of command-line tools includes the cdrecord CD/DVD/Blu-ray recording software, as well as tools for reading optical media, extracting audio, and more. It's a mature project that has been around for quite a few years. Operating System: Windows, Linux, OS X.

37. cdrtfe

Cdrtfe serves as a front-end for cdrtools and some other command-line recording applications. It can burn audio CDs, data discs, bootable discs, DVD-Video discs, ISO images and other types of optical media. The latest version supports Windows 10. Operating System: Windows.

38. Clementine

Based on an older version of Amarok, Clementine focuses on providing "a fast and easy-to-use interface for searching and playing your music." It supports Internet radio streams, cloud computing services like Dropbox and Google Drive, CUE sheets, tabbed playlists, audio CD playback and much more. Operating System: Windows, Linux, OS X, Android.

39. DeaDBeeF

This self-proclaimed "ultimate music player" supports a very long list of file formats. Key features include cue sheet support, tabbed playlists, cover art display, 18-band graphic equalizer, tag editor, gapless playback and more. Operating System: Linux, Unix, Android.

40. EasyTAG

EasyTAG allows users to view and edit the tag fields on MP3, MP2, MP4/AAC, FLAC, Ogg Vorbis, MusePack, Monkey's Audio, and WavPack files. It includes a tree-based browser and CDDB support for manual and automatic searches. Operating System: Windows, Linux

41. Exaile

Another option for Linux users, Exaile offers both playback and a powerful music manager. Key features include smart playlists, advanced track tagging, multiple plug-ins, automatic album art, lyrics and much more. Operating System: Linux.

42. FlacSquisher

This tool was made for audiophiles who like to keep their original music in the lossless FLAC file format. FlacSquisher converts those files to MP3s so that users can take them with them on mobile devices without taking up too much space. Operating System: Windows.

43. Fre:ac

Fre:AC stands for "free audio converter," and it can rip audio CDs or convert among numerous file formats. It's also portable, meaning that you can run it from a USB thumb drive without installing it on your system. Operating System: Windows.

44. Frinika

Java-based Frinika is a lightweight but fairly complete music workstation. It includes a sequencer, soft-synths, real-time effects and recording capabilities. Operating System: OS Independent

45. Giada

Giada describes itself as "a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians." It's not quite as full-featured as the other options on the list, but it is an effective, lightweight looping tool. Operating System: Linux.

46. Guayadeque

Created for "all music enthusiasts," Guayadeque is a full-featured music management system that can handle large file collections. Noteworthy features include a configurable crossfader engine, configurable silence detector for gapless playback, labeling, smart play mode, last.fm support and more. Operating System: Linux

47. Hydrogen

"Professional yet simple and intuitive," Hydrogen is a drum machine for Linux only. The video on the site helps you quickly see how it works and what it can do. Operating System: Windows, Linux, OS X.

48. Jajuk

Java-based Jajuk works on multiple platforms. Aimed at advanced users, it offers a very full feature set as well as an intuitive interface. Operating System: OS Independent.

49. Jams

Formerly a paid app, Jams is now an open source Android music player with an elegant interface. It can connect to Google Play Music for purchasing songs and includes features like tag support, blacklisting, 9-band equalizer, scrobbling, crossfade, album art download and more. Operating System: Android.

50. KMid

This KDE app plays both Midi and karaoke files, making it easy for you to serenade your sweetheart. It includes a piano player interface and also accepts input from external keyboards. Operating System: Windows

51. Linux MultiMedia Studio (LMMS)

"Made by musicians, for musicians," LMMS is a full-featured music production system with plenty of presets and samples built in. Note that despite the word "Linux" in the name, it is available for Windows and OS X as well. Operating System: Windows, Linux, OS X

52. Mixxx

Made for professional DJs, Mixxx offers "everything you need to start making DJ mixes in a tight, integrated package." It supports more than 30 DJ MIDI controllers, integrates with iTunes and includes BPM detection and sync. Operating System: Windows, Linux, OS X.

53. MOC

Simply select a directory, and the MOC (Music On Console) audio player will play all files in that directory. Supported file formats include MP3, Ogg Vorbis, FLAC, Musepack, Speex, WAVE, AIFF, and AU. Operating System: Linux/Unix, OS X

54. Mp3splt

Mp3splt is an audio utility that does just one thing—it lets you cut mp3 and ogg files into smaller files and rename them. It’s especially useful if you need to split an entire album into individual tracks. Operating System: Windows, Linux, OS X

55. MuseScore

If you are a musician, teacher or composer interested in generating your own sheet music, MuseScore makes it very easy and offers most of the same features you'll find in the proprietary software. The website includes some tutorials and plenty of other help to get you started, and the interface is very intuitive. Operating System: Windows, Linux, OS X

56. Nightingale

Nightingale promises users "a beautiful interface with a wide range of supported audio formats, all with multi-platform support." It has a large library of add-ons that extend its capabilities. Operating System: Windows, Linux, OS X.

57. orDrumbox

Another open source option for creating your own drum loops and feeds, orDrumbox offers an easy-to-use interface. Features include auto-composition, poly-rhythms, an arpeggiator, automatic sounds/track matching , custom soft-synths and low-fi rendering. Operating System: Windows, Linux, OS X.

58. Qmmp

Qmmp, which stands for "Qt-based MultiMedia Player," offers features like support for skins, 10-band equalizer, streaming playback, cover art, cue sheet support and multiple playlists. Its interface is very simple and similar to older apps like Winamp and XMMS. Operating System: Windows, Linux

59. Radio Downloader

If your favorite online radio station only offers streaming content, you can turn it into a podcast you can listen to any time with Radio Downloader. It comes with built-in support for BBC content and a helpful "favourites" tab. Operating System: Windows

60. Rhythmbox

Rhythmbox is a Linux-only audio player for the GNOME desktop. The interface and feature set are fairly basic. Operating System: Linux.

61. SoX

This cross-platform command line tool calls itself the "Swiss Army knife of sound processing programs." It can convert files from one type to another, record and play audio files, and add effects. Operating System: Windows, Linux, OS X.

62. TEncoder

This app provides an interface to three other popular open source video tools: FFMPEG, MEncoder and Mplayer. It can convert video files, rip unprotected DVDs, add subtitles, download from YouTube, extract audio or video and more. Operating System: Windows.

63. XiX Music Player

This cross-platform player supports album art and lyrics, reverse play, crossfading, trimming, shuffle, repeat, song rating, search, and more. It's also small enough to run on a Raspberry Pi board. Operating System: Windows, Linux, OS X

64. xwax

This Linux-only tool was designed for beat mixing and scratch mixing. Features include needle drops, pitch changes, scratching, spinbacks and rewinds. Operating System: Linux.

65. Yoshimi

Yoshimi is a Linux-only software synthesizer forked from an older version of ZynAddSubFX. The project name comes from a song by The Flaming Lips. Operating System: Linux.

66. ZynAddSubFX

This software synthesizer comes in Windows and Linux versions. Features include real-time, polyphonic, multitimbral and microtonal capabilities and a long list of effects and filters. Operating System: Windows, Linux.

67. AMANDA

The Advanced Maryland Automatic Network Disk Archiver, or AMANDA, is a popular network backup solution that can save data from Linux, Unix or Windows systems to hard drives, tape or optical media. Zmanda, which sponsors the project, offers commercial products based on the same technology. Operating System: Windows, Linux, OS X.

68. Areca Backup

For standalone systems, Area is an easy-to-use but versatile backup solution. Key features include delta backup, compression, encryption, filters, as-of-date recovery and more. Operating System: Windows, Linux

69. Attic

If you are looking to minimize the amount of storage space you need for backups, consider Attic, which includes built-in deduplication. It also includes optional 256-bit AES encryption and can transfer files to remote hosts via SSH. Operating System: Linux

70. Backup

This Ruby-based tool promises "easy full stack backup operations on UNIX-like systems." It includes a tool for modeling backups. Operating System: Linux, OS X

71. Backupninja

This tool makes it easier to coordinate and manage backups on your network. It incorporates several of the other tools on this list including Duplicity and rsync. Operating System: Linux

72. BackupPC

Robust enough for enterprise use, BackupPC backs up data from Linux and Windows systems to disk. Noteworthy features include a unique pooling scheme, optional compression, a web interface and support for mobile devices. Operating System: Windows, Linux

73. Back In Time

Inspired by an older solution called FlyBack, Back in Time takes snapshots of specified directories. It's easy to setup and includes a simple scheduler. Operating System: Linux

74. Bacula

Another option for enterprises, Bacula is a network backup solution that aims to be easy to use and very efficient. Commercial support and services for the solution are available throughBacula Systems. Operating System: Windows, Linux, OS X

75. Bareos

Forked from Bacula, Bareos is a popular open source backup option that is under very active development. Bareos.com offers paid support and services for the tool. Operating System: Windows, Linux, OS X

76. Box Backup

This "completely automatic" backup solution creates backups continuously and can also create snapshots when desired. It includes encryption and optional RAID capabilities. Operating System: Windows, Linux

77. BURP

Short for "BackUp And Restore Program," BURP is a network backup solution based on librsync (see below). It is designed to be easier to configure than some other open source solutions, and it can do delta backups. Operating System: Windows, Linux

78. Clonezilla

Designed to replace Acronis True Image or Norton Ghost, Clonezilla is useful for both system deployment and backup and recovery. It comes in two flavors: live for standalone systems and SE for network backup or cloning multiple systems at once. Operating System: Linux

79. Create Synchronicity

Powerful but lightweight, this backup tool takes up only 220KB of space on your drive. It supports multiple languages, has an intuitive interface and includes a scheduler. Operating System: Windows

80. DAR

Disk Archive, a.k.a. DAR, is an older command-line tool for backup. For those who prefer a GUI, one is available through DarGUI. Operating System: Windows, Linux, OS X

81. DirSync Pro

This "small but powerful," utility offers incremental backup, filtering and scheduling capabilities. It also boasts a user-friendly interface, and it offers the ability to analyze two sets of files or folders and detect the changes between them. Operating System: Windows

82. DriverBackup!

While this utility isn't a complete system backup solution, it does back up Windows drivers. It can also remove unwanted drivers. Operating System: Windows

83. Duplicity

Based on the librsync library, Duplicity creates encrypted archives and uploads them to remote or local servers. It can use GnuPG to encrypt and sign archives if desired. Operating System: Linux

84. FOG

FOG offers cross-platform cloning and imaging capabilities for networks of any size from 5 to 50,000 systems. It boasts that it "offers commercial-grade support at no cost." Operating System: Linux, Windows, OS X.

85. FreeFileSync

A tool for standalone systems, FreeFileSync aims to save users time when setting up and running backups. It is cross-platform and includes 64-bit support. Operating System: Linux, Windows, OS X

86. FullSync

Although it was designed to help web developers push updates to their sites, FullSync can also be used by anyone to create backups. Key features include multiple modes, flexible rules, buffered filesystems, support for multiple file transfer protocols and more. Operating System: Linux, Windows, OS X

87. Grsync

Grsync takes the older rsync synchronization tool and adds an easy-to-use GUI. Noteworthy features include unlimited sessions, highlighted errors, batch capabilities and more. Operating System: Linux, Windows, OS X

88. LuckyBackup

Like Grsync, LuckyBackup was also based on rsync. It has won several awards, but development on this project has slowed. Operating System: Linux, Windows

89. Mondo Rescue

For Linux and FreeBSD only, Mondo Rescue is a disaster recovery solution that supports tape, disk, network or optical media backups. According to its website, its users include "Lockheed-Martin, Nortel Networks, Siemens, HP, IBM, NASA's JPL, the US Dept of Agriculture, dozens of smaller companies." Operating System: Linux, Free BSD

90. Obnam

Easy-to-use and secure, Obnam is a snapshot backup solution with built-in deduplication and encryption capabilities. It stores data to hard disks or online via SFTP. Operating System: Linux

91. Partimage

This tool saves partitions of drives as image files, making it useful for backup or installing the same image on multiple systems. It can run across networks or on a standalone PC. Operating System: Linux

92. Redo

Redo boasts that it can get a crashed system back up and running in as little as 10 minutes. It's very easy to use and has bare-metal restore capabilities. Operating System: Windows, Linux

93. Rsnapshot

As you might expect from the name, this utility makes a snapshot of your file system for remote or local backup. According to the website, it can be set up in just a few minutes. Operating System: Linux, OS X

94. Rsync

Rsync is a Unix-based file-transfer utility that has synchronization capabilities that make it suitable for creating backups or mirroring. It's a useful tool but is best used by advanced users. Operating System: Linux, Windows, OS X

95. SafeKeep

For Linux users only, SafeKeep focuses on security and simplicity. It's a command line tool that is a good option for a small LAN. Operating System: Linux

96. SMS Backup+

This tool allows you to backup your text messages and call logs on Gmail. You can also transfer data from Gmail back to your phone. Operating System: Android

97.SnapBackup

Designed to be as easy to use as possible, SnapBackup backs up files with just one click. It can copy files to a flash drive, external hard drive or the cloud, and it includes compression capabilities. Operating System: Windows, Linux, OS X

98. Synkron

While this app is focused primarily on synchronization, it can be used for creating backups as well. Key features include analysis capabilities, blacklisting, restores and cross-platform support. Operating System: Windows, Linux, OS X

99. Unison

Like Synkron, Unison is a file synchronization tool. It can copy files between any two systems connected to the internet, and it has features in common with source code management tools as well as with backup utilities. Operating System: Windows, Unix

100. UrBackup

This client-server backup solution does both image and file backups. It promises "both data safety and a fast restoration time." Operating System: Windows, Linux

101. Weex

The Weex developers intended it primarily as a tool for pushing content to websites, but it can also be used to synchronize or backup files. It supports FTP file transfer. Operating System: Windows, Linux

102. Win32DiskImager

Averaging more than 50,000 downloads every week, this tool is a very popular way to copy a disk image to a new machine. It's very useful for systems administrators and developers. Operating System: Windows

103. XSIbackup

XSIbackup can backup VMwareESXi environments version 5.1 or greater. It's a command line tool with a scheduler, and it runs directly on the hypervisor. Operating System: VMwareESXi

104. Alluxio

Formerly known as Tachyon, Alluxio describes itself as "a memory-centric distributed storage system enabling reliable data sharing at memory-speed across cluster frameworks." It works with tools like Spark and Hadoop to speed performance on big data queries. Operating System: Linux, OS X

105. Ambari

Part of the Hadoop ecosystem, this Apache project offers an intuitive Web-based interface for provisioning, managing, and monitoring Hadoop clusters. It also provides RESTful APIs for developers who want to integrate Ambari's capabilities into their own applications. Operating System: Windows, Linux, OS X.

106. Avro

This Apache project provides a data serialization system with rich data structures and a compact format. Schemas are defined with JSON and it integrates easily with dynamic languages. Operating System: OS Independent.

107. Cascading

Cascading is an application development platform based on Hadoop. Commercial support and training are available. Operating System: OS Independent.

108. Chukwa

Based on Hadoop, Chukwa collects data from large distributed systems for monitoring purposes. It also includes tools for analyzing and displaying the data. Operating System: Linux, OS X.

109. Data Torrent RTS

Data Torrent has been around a while, but it first open sourced its Core RTS technology in June of this year. It claims to be "the industry's only open source enterprise-grade unified stream and batch platform." It comes in community, standard and enterprise versions. Operating System: Linux

110. Disco

Originally developed by Nokia, Disco is a distributed computing framework that, like Hadoop, is based on MapReduce. It includes a distributed filesystem and a database that supports billions of keys and values. Operating System: Linux, OS X.

111. Flume

Flume collects log data from other applications and delivers them into Hadoop. The website boasts, "It is robust and fault tolerant with tunable reliability mechanisms and many failover and recovery mechanisms." Operating System: Linux, OS X.

112. Genie

Created by Netflix, Genie allows IT administrators to manage Hadoop jobs running on cloud computing services. Netflix uses it to run many thousands of Hadoop jobs every day. Operating System: Windows, Linux, OS X

113. Hadoop

This Apache-sponsored project is the best-known big data tool available. Numerous companies, including Amazon Web Services, Cloudera, Hortonworks, IBM, Pivotal, SyncSort and VMware, offer related products or commercial support for Hadoop. Well-known users include Alibaba, AOL, eBay, Facebook, Google, Hulu, LinkedIn, Spotify, Twitter and Yahoo. Operating System: Windows, Linux, OS X

114. Hadoop Distributed File System

HDFS is the file system for Hadoop, but it can also be used as a standalone distributed file system. It's Java-based, fault-tolerant, highly scalable and highly configurable. Operating System: Windows, Linux, OS X.

115. HPCC

This alternative to Hadoop also offers massive parallel processing and storage of big data workloads. Paid enterprise services are available. Operating System: Linux

116. Hypertable

Very popular with Web companies, Hypertable was developed by Google as a way to make databases more scalable. Its users include Baidu, eBay, Groupon and Yelp. It is compatible with Hadoop, and commercial support and training are available. Operating System: Linux, OS X

117. Ignite

This Apache project describes itself as "a high-performance, integrated and distributed in-memory platform for computing and transacting on large-scale data sets in real-time, orders of magnitude faster than possible with traditional disk-based or flash technologies." The platform includes data grid, compute grid, service grid, streaming, Hadoop acceleration, advanced clustering, file system, messaging, events and data structure capabilities. Operating System: OS Independent.

118. Kudu

Currently in beta trials, Kudu is an Apache project that is part of the Hadoop ecosystem. It combines a simple data model with columnar storage, low latency and distributed architecture. Operating System: Windows, Linux, OS X

119. Lipstick

This Netflix project provides an easy-to-understand graphical representation of Hadoop Pig jobs. It updates as the job executes so that administrators and developers no longer need to sift through log data. Operating System: Windows, Linux, OS X

120. Lucene

Java-based Lucene performs full-text searches very quickly. According to the website, it can index more than 150GB per hour on modern hardware, and it includes powerful and efficient search algorithms. Development is sponsored by the Apache Software Foundation. Operating System: OS Independent.

121. Lumify

Created by a company called Altamira Technologies, Lumify describes itself as an "open source big data analysis and visualization platform." It makes it easy to create 2D or 3D graphs that show the relationship between entities or to overlay data on maps. For those who are interested in learning more about how it works, the website offers several videos that show Lumify in action, and it also has a demo site that allows users to upload their own data and try out the software. Operating System: Linux.

122. MapReduce

An integral part of Hadoop, MapReduce is a programming model that provides a way to process large distributed datasets. It was originally developed by Google, and it also used by several other big data tools on our list, including CouchDB, MongoDB and Riak. Operating System: OS Independent.

123. Mesos

Apache Mesos is a resource abstraction tool that makes it possible for enterprises to treat their entire data center as a single pool of resources, and it is popular with companies that are also running Hadoop, Spark and similar applications. Organizations that use it include Airbnb, CERN, Cisco, Coursera, Foursquare, Groupon, Netflix, Twitter and Uber. Operating System: Linux, OS X

124. Oozie

This workflow scheduler is specifically designed to manage Hadoop jobs. It can trigger jobs by time or by data availability, and it integrates with MapReduce, Pig, Hive, Sqoop and many other related tools. Operating System: Linux, OS X.

125. Pandas

The Pandas project includes data structures and data analysis tools based on the Python programming language. It allows organizations to use Python as an alternative to R for big data analysis projects. Operating System: Windows, Linux, OS X.

126. Pig

Apache Pig is a platform for distributed big data analysis. It relies on a programming language called Pig Latin, which boasts simplified parallel programming, optimization and extensibility. Operating System: OS Independent.

127. Pinot

Developed by LinkedIn and open sourced in June 2015, Pinto is a distributed OLAP datastore that enables real-time scalable analytics. Key features include column orientation, pluggable indexing technology, data ingestion from Kafka and Hadoop and support for a SQL-like language. Operating System: Windows, Linux, OS X

128. Pivotal GemFire, Greenplum Database and HAWQ

Pivotal, a spinoff of EMC and VMware, announced earlier this year that they would be open sourcing key pieces of their big data suite, including GemFire, Greenplum Database and HAWQ. Gemfire helps organizations build data-driven applications, Greenplum is an analytics-enabled database, and HAWQ is a SQL analytics engine for Hadoop. Operating System: Windows, Linux, OS X

129. Presto

Developed by Facebook, Presto describes itself as "an open source distributed SQL query engine for running interactive analytic queries against data sources of all sizes ranging from gigabytes to petabytes." Facebook says that it uses it for queries against a 300PB data warehouse, and other users include Airbnb and Dropbox. Operating System: Linux

130. Solr

This "blazing-fast" enterprise search platform claims to be highly reliable, scalable and fault tolerant. The companies using it include AT&T, Ticketmaster, Comcast, Instagram, Netflix, IBM, Adobe and SAP Hybris. Operating System: OS Independent

131. Spark

Apache Spark boasts that it can "run programs up to 100x faster than Hadoop MapReduce in memory, or 10x faster on disk." Organizations "powered by" Spark include Amazon, Baidu, Groupon, Hitachi Solutions, IBM, MyFitnessPal, Nokia and Yahoo. Operating System: Windows, Linux, OS X

132. Sqoop

Enterprises frequently need to transfer data between their relational databases and Hadoop, and Sqoop is one tool that gets the job done. It can import data to Hive or HBase and export from Hadoop to RDBMSes. Operating System: OS Independent.

133. Storm

Apache Storm offers to do for real-time data what Hadoop does for batch data. Its website lists The Weather Channel, Twitter, Yahoo, WebMD, Spotify, Verisign, Flipboard and Klout among its users. Operating System: Linux

134. Samza

Originally developed by LinkedIn, this Apache top-level project does distributed stream processing. It relies on the Kafka messaging system as well as Hadoop YARN distributed processing technology. Operating System: Windows, Linux, OS X

135. Terracotta

Calling its BigMemory technology "the world's premier in-memory data management platform," Terracotta boasts 2.1 million developers and 2.5 million deployments of its software. The company also offers commercial versions of its software, plus support, consulting and training services. Operating System: OS Independent.

136. Tez

Built on top of Apache Hadoop YARN, Tez is "an application framework which allows for a complex directed-acyclic-graph of tasks for processing data." It allows Hive and Pig to simplify complicated jobs that would otherwise take multiple steps. Operating System: Windows, Linux, OS X.

137. Zookeeper

This administrative big data tool describes itself as "a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services." It allows nodes within a Hadoop cluster to coordinate with each other. Operating System: Linux, Windows (development only), OS X (development only).

138. jBilling

Downloaded more than 120,000 times, jBilling claims to be "world's leading open source enterprise billing solution." It's particularly good for subscription-based billing, and notable customers include Deutsche Telecom, Constant Contact and Rackspace. In addition to the free version, paid support and services are available. Operating System: OS Independent

139. SimpleInvoices

This web-based invoicing system is easy to use, sending electronic invoices as PDF files. You can download the code and host it on your own server or use the hosting services provided by Smarter Invoices. Operating System: OS Independent.

140. Siwapp

Another Web-based invoicing option, Siwapp allows users to create professional-looking, secure invoices with a minimum amount of hassle. Check out the screenshots and demo on the site to get a feel for how easy it is to use. Operating System: OS Independent.

Bitcoin

141. OpenBazaar

Formerly known as DarkMarket, this project allows users to trade BitCoin for goods and services freely. Based on BitTorrent technology, it emphasizes privacy and requires no fees for trades. It is currently in beta trials. Operating System: Windows, Linux, OS X

Blogging

142. B2evolution

B2evolution can run a standalone blog, multiple blogs or an entire website. It also includes features for setting up a community and marketing your site, and lots of information about hosting is available on the website. Operating System: OS Independent

143. Ghost

Downloaded more than 340,000 times, Ghost is an open source blogging platform based on Node.js. You can run it on your own Web server for free or use the hosted service, with prices starting at $10 a month. Operating System: Windows, Linux, OS X.

144. WordPress

Used by more than 60 million people and organizations, WordPress is one of the most popular blogging platforms available. Users can host their own blogs using the open source software or use the service provided at WordPress.com. Microsoft has also partnered with the organization on Scalable WordPress, a Web application that runs on Azure. Operating System: Windows, Linux, OS X, iOS, Android, BlackBerry, Windows Phone, others

Browsers

145. Chromium

Chromium is the open source project behind Google's Chrome browser. It aims to be safer, faster and more stable than other browsers. Operating System: Windows, Linux, OS X, Chrome OS, iOS, Android

146. Dooble

Less well-known than some of the other open source browsers, Dooble was created in order to offer better privacy on the Web. It encrypts most of the information it saves, and it includes the option of automatically deleting cookies. Operating System: Windows, Linux, OS X

147. Firefox

According to NetMarketShare, more than 13 percent of people use Firefox as their Web browser. It's made by Mozilla, which has been named the "most trusted Internet company for privacy." Operating System: Windows, Linux, OS X, Android

148. Tor Browser

Designed for privacy protection, the Tor browser cloaks the identity of users by bouncing communications of various servers around the world. It can be installed on a system or run from a thumb drive. Operating System: Windows, Linux, OS X

Bugtrackers

149. BugTracker.NET

Boasting thousands of users, BugTracker.NET is easy to use and highly configurable. It supports Subversion, Git, and Mercurial, and the website includes a helpful demo and a link to comparisons of various bug tracking systems. Operating System: Windows

150. Bugzilla

A favorite in the open source community, Bugzilla is used by Mozilla, the Linux Foundation, GNOME, KDE, Apache, LibreOffice, Open Office, Eclipse, Red Hat and Novell, among others. Key features in this bugtracker include advanced search capabilities, email notifications, scheduled reports, time tracking, excellent security and more. Operating System: Windows, Linux, OS X

151. FlySpray

FlySpray describes itself as "an uncomplicated, Web-based bug tracking system written in PHP for assisting with software development." It supports multiple databases, including MySQL and PGSQL, and it's easy to use. Operating System: OS Independent

152. GNATS

GNATS is the Gnu project's bug tracking system. Gnatsweb provides a web interface for the command line tool, and several third-party interfaces are also available. Operating System: OS Independent

153. MantisBT

This Web-based bug tracker integrates with most SQL databases and can be accessed with any browser. It's easy to install and has an enormous list of features. Operating System: Windows, Linux, OS X

154. BIRT

BIRT isn't a complete BI suite; instead, it focuses on technology that can be "used to create data visualizations and reports that can be embedded into rich client and web applications." It is sponsored by OpenText, Innovent Solutions and IBM. Operating System: Windows, Linux, OS X

155. Jaspersoft

This popular business intelligence suite is available in a Cloud Analytics version that runs on Amazon Web Services. It also comes in both free and paid versions for on-premise deployment. Operating System: OS Independent.

156. JMagallanes

This Java-based reporting tool can create static or dynamic reports and charts. It can accept data from SQL, Excel, XML and other sources, and it can create PDF, XML or application-specific files. Operating System: OS Independent

157. KNIME

KNIME offers a free, open source Analytics Platform, with several commercial extensions available; these include Personal Productivity, Partner Productivity, TeamSpace, Server, Big Data Extension and Cluster Execution. It claims to be "quick to deploy, easy to scale, intuitive to use and open to all." Operating System: Windows, Linux, OS X

158. OpenI

OpenI strives to help enterprises go from "data to insights in 72 hours with open source." It's a reporting tool that integrates with other open source BI solutions and can be deployed to Amazon Web Services very easily. Operating System: OS Independent.

159. Pentaho

Now owned by Hitachi Data Systems, Pentaho describes itself as "a comprehensive data integration and business analytics platform." Its customers include Caterpillar, Halliburton, BR and Nasdaq. It allows organizations to integrate big data from a variety of sources, including Hadoop, NoSQL databases, analytic databases and relational databases. It then enables interactive analysis, reporting and visualizations, allowing users to create customized dashboards that suit their unique purposes.

The open source version of the Pentaho software is available on the Community website. In addition, the company offers a free thirty-day trial of its paid enterprise software, and it offers a variety of paid services like custom visualizations, training, enterprise support, consulting, certification and technical support. Operating System: Windows, Linux, OS X

160. SpagoBI

SpagoBI is an open source business intelligence and big data analytics platform. The software is completely free, but paid user support, maintenance, consulting and training are available for purchase. It includes tools for reporting, multidimensional analysis (OLAP), charts, location intelligence, data mining, ETL and more. It also integrates with popular in-memory processing engines and enables real-time processing. Operating System: OS Independent

Business Process Management (BPM)

161. Activiti

Designed for business people, developers and systems administrators, Activiti is a lightweight workflow and BPM solution. Paid enterprise support is available through Alfresco. Operating System: OS Independent

162. Bonita Open Solution

Bonita claims to be "the most powerful BPM-based application platform." It comes in community and subscription editions, and paid training and consulting are also available. Operating System: OS Independent

163. ProcessMaker

Award-winning ProcessMaker offers tools to help enterprises automate workflow processes as well as performing full-scale BPM. It comes in community, enterprise and cloud editions. Operating System: Windows, Linux.

CAD

164. Archimedes

Designed with architects in mind, Archimedes is a less full-featured CAD modeling tool. It is based on Eclipse's Rich Client Platform and is highly extensible. Operating System: Windows, Linux, OS X

165. BRL-CAD

Early development activity on this very mature project began way back in 1979, and the U.S. military has been using it to model weapons systems for more than twenty years. It includes more than 400 tools for constructive solid geometry modeling. Operating System: Windows, Linux, OS X, others

166. FreeCAD

Useful for hobbyists, educators and experienced CAD professionals, FreeCAD is a general purpose 3D modeling tool. It has been around since 2001 and has a very full set of features. Operating System: Windows, Linux, OS X, others

Charts

167. GraphViz

Another alternative for creating network diagrams, GraphViz lets you use simple text or GXL (a variant of XML) to describe charts, and then it does the drawing work for you. See the Gallery for examples of the types of graphics it can create. Operating System: Windows, Linux, OS X.

Chemistry

168. Avogadro

For more advanced students and professional chemists, Avogrado offers an intuitive interface for creating visualizations of molecules. The website also includes some tips for educators on integrating Avogadro into the classroom. Operating System: Windows, Linux

169. Jmol

This java-based app lets students create diagrams of atoms, molecules, macromolecules, crystals, and more. The site includes a handbook and tutorials for helping you learn how to use the software. Operating System: OS Independent.

170. Kalzium

Need help with introductory chemistry? This KDE app allows students to explore the periodic table, and it comes complete with a molecular weight calculator, an isotope table, a 3D molecule editor and an equation solver for stoichiometric problems. (Note that in order to use Kalzium on Windows, you'll have to download KDE for Windows.) Operating System: Windows, Linux

Cinema Camera

171. AXIOM Beta

Made by a company called apertus, the AXIOM Beta is the world's first open source cinema camera. Beta prototypes began shipping in August, and the company has a well-developed road map for eventually shipping a complete device based on a modular open source hardware concept. Operating System: Linux

Classroom Management

172. iTALC

Intelligent Teaching and Learning with Computers, aka iTALC, gives teachers the tools they need to manage a computer-based classroom without the high license fees of commercial software. Key features include remote control, demo viewing, overview mode, workstation locking and VPN access for off-site students. Operating System: Windows, Linux

173. AppScale

AppScale allows users to run applications based on Google App Engine on any infrastructure. It is used by organizations like the World Wildlife Federation, Chico's and Google itself. Operating System: Linux.

174. Cloud Foundry

Cloud Foundry offers open source tools for building a platform as a service. Claiming to be "built by industry leaders for industry leaders," it lists IBM, Pivotal, Hewlett Packard Enterprise, VMware, Intel, SAP and EMC as its supporters. Operating System: Linux

175. CloudStack

This turnkey IaaS solution forms the basis for many public and private clouds. It has an extremely long list of users that includes Alcatel-Lucent, Apple, Autodesk, BT, CA Technologies, Citrix, Cloudera, Dell, Fujitsu, SAP and Verizon. Operating System: OS Independent

176. Dasein Cloud

A Dell project, Dasein Cloud is "an open source cloud abstraction library for Java." It allows developers to write applications once that can be translated to any cloud provider's model. Operating System: Linux.

177. Eucalyptus

Now managed by Hewlett Packard Enterprise (HPE), Helion Eucalyptus enables hybrid cloud computing by allowing organizations to build private clouds that are compatible with Amazon Web Services (AWS), which. Paid support is available from HPE. Operating System: Linux.

178. FOSS-Cloud

With FOSS-Cloud, users can build their own public or private cloud computing environments. It includes tools for VDI, IaaS, PaaS, SaaS and cloud storage. Operating System: Windows, Linux.

179. ManageIQ

This cloud management solution is the open source project behind Red Hat CloudForms. It enables services like chargebacks, service orchestration, lifecycle management and automated workflows, as well as enabling hybrid cloud environments. Operating System: Linux, VMware

180. Oneye

Forked from eyeOS, which became closed source after version 2.0, Oneye allows users to set up their own servers for cloud desktop functionality. There is a demo available on the website. Operating System: Linux.

181. OpenNebula

OpenNebula promises "the simplest could deployment and management experience." Paid support, training, engineering and consulting are available through OpenNebula Systems. Operating System: Linux.

182. openQRM

Downloaded more than 400,000 times, the open source version of openQRM offers free cloud computing software that is suitable for small deployments. It also comes in multiple paid enterprise editions, and the company behind the project also offers paid hardware/software bundles and a variety of related services. Operating System: Linux.

183. OpenShift

This Red Hat project aims to make it easy for enterprises to develop, host and scale cloud-based applications. Red Hat offers a public PaaS under the OpenShift name, as well as the open source software and an enterprise version for organizations that want to build a private PaaS. Operating System: Linux.

184. OpenStack

This very popular cloud computing platform claims that "hundreds of the world's largest brands" rely on it every day. Its sponsors include AT&T, Ubuntu, Hewlett Packard Enterprise, IBM, Intel, Rackspace, Red Hat, SUSE, Cisco, Dell, EMC, Symantec and many other well-known technology firms. Operating System: OS Independent

185. ownCloud

Designed to help users set up their "own cloud," this project emphasizes file syncing and sharing, as well as collaboration capabilities. A paid enterprise version is available through OwnCloud.com. Operating System: Windows, Linux.

186. Roboconf

This tool makes it easier to deploy applications to the cloud or other distributed computing environments. It supports many public cloud services, including AWS, Microsoft and Vmware, as well as most private cloud environments. Operating System: OS Independent

187. Scalr

This cloud management platform has been highly ranked by market research firms, and it simplifies the process of managing multiple cloud environments. Its notable users include Expedia, Samsung, the NASA Jet Propulsion Laboratory, Accenture, Sony and Autodesk. Operating System: Linux

188. Synnefo

Co-financed by Greece and the European Union, Synnefo offers a complete open source cloud computing stack written in Python. It uses OpenStack APIs to simplify management, and it also relies on Google Ganeti for cluster management and Archipelago for storage management. Operating System: Linux.

Cloud Storage

189. Camlistore

Content-Addressable Multi-Layer Indexed Storage, or Camlistore for short, offers "formats, protocols, and software for modeling, storing, searching, sharing and synchronizing data in the post-PC era." Stored data can be accessed from any device. Note that it is for more technically minded users, not beginners. Operating System: Linux

190. CloudStore

An alternative to Dropbox, CloudStore synchronizes data between a system and online storage. Its features include strong encryption, password-less authentication, flexible synchronization, fast setup and auto-resumes for interrupted data transfers. Operating System: Linux

191. Cozy

Cozy invites individuals to "store, sync, and share your data just the way you want it" by setting up their own personal cloud. It hopes to evolve into "a universal tool that can help you organize your life and make you more productive by automating routine tasks." Operating System: Linux

192. DREBS

Designed for Amazon Web Services users, DREBS stands for "Disaster Recovery for Elastic Block Store." It runs on Amazon's EC2 services and takes snapshots of EBS volumes for disaster recovery purposes. Operating System: Linux

193. Duplicati

Duplicati works with cloud storage services like Amazon, Windows OneDrive, Google Drive and Rackspace to create encrypted backups. It does a full backup on first use and incremental backups after that. Operating System: Windows, Linux, OS X

194. DuraCloud

With DuraCloud, users can backup their files to multiple cloud storage providers at once or move their files from one cloud to another at will. In addition to the open source software, it is also offered as a paid service. Operating System: Windows, Linux, OS X.

195. FTPbox

This tool also allows users to set up their own cloud storage solution. And as you might guess from the name, it transfers files via FTP. Operating System: Windows

196. LipSync

Another option for setting up a DropBox-like service for yourself, LipSync is a very lightweight tool based on OpenSSH, rsync and lsyncd. The project was born as an idea in a blog post. Operating System: Linux

197. Pydio

Formerly known as AjaXplorer, Pydio offers enterprise-class cloud storage designed to meet the needs of developers and system administrators. Downloaded more than a million times, it claims to be scalable, secure, highly flexible and loved by end users. A paid enterprise distribution is available. Operating System: Windows, Linux (Android and iOS clients available)

198. Rockstor

Rockstor offers several open source storage solutions, including cloud storage servers for individuals and SMBs. It also offers an open source NAS solution. Paid support is available. Operating System: Linux

199. SeaFile

SeaFile is both an open source project for setting up cloud storage with client-side encryption and a paid cloud service with the same capabilities. It's enterprise-ready and promises fast performance Operating System: Windows, Linux, OS X, Android, iOS

200. Sheepdog

According to its website, Sheepdog is "a distributed object storage system for volume and container services and manages the disks and nodes intelligently." It supports snapshotting, cloning and thin provisioning, and it is compatible with OpenStack Swift and Amazon S3. Operating System: Linux

201. Skylable

Downloaded more than 285,000 times, Skylable allows users to create their own object storage solution that is compatible with Amazon's S3 service. A paid, supported version is also available. Operating System: Windows, Linux, OS X

202. SparkleShare

With SparkleShare, you create a special folder on your system that is automatically synchronized with a host folder. It's a good option for collaboration, but less than ideal for full system backups. Operating System: Windows, Linux, OS X

203. StackSync

This tool describes itself as "the open source personal cloud for organizations." Like Dropbox, it syncs files across multiple devices, and it also includes client-side encryption for security. Operating System: Windows, Linux

204. Syncany

Syncany can encrypt and sync files stored on any cloud storage service. It is still an alpha release, but is working. Operating System: Windows, Linux, OS X

205. Syncthing

Yet another DropBox replacement, Syncthing allows users to choose where their data is stored—on their own servers or a cloud service. It runs on any operating system and includes an easy-to-use Web GUI. Operating System: Windows, Linux, OS X

206. Unison

Another file synchronization tool, Unison can handle changes made to multiple copies of a file at the same time, making it a good option for distributed development teams or enterprise collaboration as well as for backup needs. It can work cross-platform and transfers files via SSH. Operating System: Windows, Linux, OS X,

Collaboration/Groupware

207. Collabtive

Similar to Basecamp, Collabtive offers web-based project management that includes time-tracking and reporting. Download the software and host it yourself, or purchase on a SaaS basis. Operating System: OS Independent.

208. cyn.in

This groupware tool includes wikis, blogs, file repositories, event calendars, bookmark directories, discussion boards and multimedia galleries. It comes in free and commercially supported versions, and it is also available as an on-demand cloud service. Operating System: Windows, Linux, OS X.

209. EGroupware

EGroupware emphasizes flexibility, offering configurable custom fields and making it easy to integrate data from other applications. In addition to the free community edition, it also comes in a full version for on-premise deployment and a cloud version with several pricing tiers. Operating System: OS Independent.

210. Feng Office

Feng Office boasts more than 2 million users at organizations like University of California Berkeley, Airbus, NASA, Porsche Design, Xerox and the NBA. It comes in both free and paid community editions, as well as professional and enterprise editions and the Feng Sky cloud-based option. Operating System: Windows, Linux, OS X.

211. Group-Office

Group-Office combines enterprise CRM and groupware features like calendar and email. The paid professional version adds helpdesk, mobile sync, time-tracking, projects and document editing. A hosted cloud version is also available. Operating System: OS Independent.

212. K-9

This is an alternative email client with features like search, multi-folder sync, flagging, filing, signatures, PGP and more. It supports Exchange, IMAP and POP3 mail servers. Operating System: Android

213. Open Atrium

Open Atrium describes itself as "a team collaboration tool with a kick of open source hotness." It includes blog, calendar, sharebox, notebook, case tracker and dashboard capabilities. Operating System: OS Independent

214. Seafile

This collaboration solution includes cloud storage, mobile document access, file syncing, messaging and other capabilities. It's available in free or paid private server versions or as a cloud-based service. Operating System: Linux.

215. TeamLab

TeamLab combines document editing, mail, CRM and project management into a single package. Download the open source version, pay for a supported enterprise version, or use the hosted cloud version. Unlike most other projects, TeamLab also offers a free cloud version for non-profits. Operating System: OS Independent.

216. TUTOS

Short for "The Ultimate Team Organization Software," includes group calendar, email, time tracking, document management and project management. In addition, it also offers special features for developers, like a bug tracker, test support and some Scrum tools . Operating System: Linux

217. Zarafa

A complete communication tool, Zarafa offers Web-based meetings and file management as well as standard calendar and email capabilities. It also offers mobile sync and secure mail. A variety of paid subscription plans are available; for the free version, click the community tab on the website. Operating System: Linux

Compression

218. 7-zip

This helpful utility can compress files 30-70 percent more than the well-known WinZip utility. It addition to its unique 7z file format, it can also pack and unpack a variety of other archive file formats. Operating System: Windows, Linux, OS X

219. ArchivConvert

This award-winning app can convert among a wide variety of archive file formats. The latest version can read 52 different formats and write to 20. Operating System: Windows

220. ArcThemALL!

With this tool, users can unpack nearly three dozen different types of compressed files and create UPX, ZIP or 7Z files. It includes encryption capabilities and the ability to create self-extracting archives. Operating System: Windows

221. Caesium

This helpful app compresses images up to 90 percent, making it easier to e-mail them or upload them to your favorite Web site. It supports most common image formats, including JPG, PNG, GIF, BMP, and WMF. Operating System: Windows

222. J7Z

This tool offers the same functionality at 7-Zip with a slightly different interface. It was designed to speed up the compression process for certain types of jobs. Operating System: Windows

223. Keka

This Mac-only archiving tool can extract from 13 different compression formats and create seven. The default compression option is a port of 7-zip. Operating System: OS X

224. KGB Archiver

KGB claims to be able to compress files even more than 7-zip. It also includes built-in AES-256 encryption. Operating System: Windows

225. PeaZip

One of the most versatile compression tools available, PeaZip can open more thn 150 different types of archive file formats. It also includes security features like encryption, two-factor authentication, secure delete and much more. Operating System: Windows, Linux, OS X.

226. cAdvisor

Short for "Container Advisor," cAdvisor is a Google project that monitors container performance and resource usage. It is intended for use with Docker. Operating System: Linux

227. Docker

Docker has quickly established itself as the dominant platform in the relatively new field of containerization. Many of the biggest names in technology, including Amazon, Microsoft, IBM, Hewlett Packard Enterprise, Red Hat, Rackspace and Canonical are building or offering products that extend or use Docker technology. Operating System: Windows, Linux, OS X

228. Kubernetes

Developed by Google, Kubernetes is an open source container management solution. It is highly scalable, running billions of containers in Google's data centers, as well as containers at Viacom, Ebay and Wikimedia. Note that in order to use it you will need Docker and a Google Cloud Platform Account. Operating System: Linux, OS X.

229. Linux Containers

This group oversees three separate containerization-related projects: LXC, a set of tools for containerization; LXD, a descendant of LXC which provides a more intuitive user experience; CG Manager container group manager daemon and the LXCFS filesystem. Its stated goal is "to offer a distro- and vendor-neutral environment for the development of Linux container technologies. Operating System: Linux

230. OpenVZ

While it's not nearly as well-known as Docker, OpenVZ also offers open source containerization technology. It provides the basis for a commercial product called Odin Virtuozzo. Operating System: Linux

231. Rkt

Part of the CoreOS operating system, Rkt describes itself as "the next-generation container manager for Linux clusters." It emphasizes security and simplicity, and it ships in ArchLinux, Fedora and several other Linux distributions. Operating System: Linux, OS X.

Content Management and Wikis

232. Alfresco

Similar to Microsoft SharePoint, Alfresco's community edition offers enterprise content management that "helps you regain control of critical business content, strengthen compliance, optimize processes and make collaboration easy." It also comes in a paid enterprise version called Alfresco One, and a cloud-based version which makes the software available on an SaaS basis. Operating System: Windows, Linux, OS X.

233. Armstrong

First released in 2011, Armstrong is a content management system specifically designed to meet the needs of news organizations. It was developed by The Bay Citizen and the Texas Tribune. Operating System: OS Independent

234. BIGACE

While BIGACE is used by many smaller organizations, it's multi-site, multi-language, and multi-user capabilities make it a possibility for larger enterprises looking for a Web CMS. Key features include a WYSIWIG editor, templates and stylesheets, and permission management. Operating System: Windows, Linux, Unix

235. Bitweaver

Bitweaver aims to make it easy for non-technical staff, like the marketing team, to add content to corporate or small business websites. It includes tools for adding articles, blogs, calendars and image galleries, and multiple add-ons are available. Operating System: OS Independent.

236. DNN

Previously known as DotNetNuke, this content management solution promises high ROI for less effort when building rich interactive websites. Its users include Canon, Time Warner Cable, Texas Instruments and Bank of America. Operating System: Windows

237. DokuWiki

This simple-to-use wiki was designed for developer teams and other small groups. Key features include unlimited revisions, recent changes viewing, section editing, anti-spam capabilities, multiple language support and more. Operating System: OS Independent

238. Drupal

Drupal claims that more than 98,000 developers are actively contributing to this extremely popular content management system. It counts Microsoft, Zend, Fastly and New Relic among its supporters, and it has a marketplace that features hundreds of companies which offer related products and services. Operating System: OS Independent

239. Family Connections

If you love scrapbooking, you might also love setting up a family Web site. This app makes it easy to create a private site for sharing photos, calendars, recipes and keeping in touch with family members. Operating System: OS Independent

240. FOSWiki

A split from the TWiki project, FOSWiki distinguishes itself with support of embedded macros to enhance content and allow end-users to create their own applications. The Web site includes considerable support for new users, as well as a number of extensions to the basic application. Operating System: OS Independent

241. Fraym

Launched in 2014, Fraym promises "a new experience for creating and editing websites" and includes features like multi-language support, SEO, integrated caching, themes and drag and drop editing. Operating System: Windows, Linux, OS X.

242. Get Simple

Designed for smaller websites, Get Simple's claim to fame is its extreme ease of use. It boasts excellent security, an intuitive interface, customization capabilities, integrated site backups and more. Operating System: Linux.

243. Hippo CMS

Hippo was the only Java-based open source CMS in Gartner's Magic Quadrant for 2015. For marketers, it offers the ability to measure "which content matters to their audiences and deliver optimal and personalized digital experiences based on this insight." It comes in open source and enterprise editions as well as the Hippo OnDemand platform as a service. Operating System: OS Independent.

244. Joomla

Joomla provides the platform for millions of websites, and it has been downloaded more than 50 million times. Among its many users are companies like eBay, Barnes & Noble, MTV and Peugeot. Operating System: OS Independent

245. MediaWiki

Best known as the software Wikipedia uses, MediaWiki also powers sites for Baidu, Vistaprint, Novell, Intel and NASA. It's a good option for creating editable web pages, and many organizations use it for their internal knowledgebases. Operating System: Windows, Linux/Unix, OS X

246. Mezzanine

Built using the Django framework, Mezzanine offers features like an intuitive interface, scheduled publishing, WYSIWYG or in-line page editing, SEO features, ecommerce, dashboard widgets, and a blog engine. Visit the live demo on the website to see it in action. Operating System: OS Independent.

247. MindTouch

This project allows enterprises to set up self-service and knowledge-base websites where their customers can quickly find information they need. The cloud-based version is now the primary version of the software, but you can still download the open source MindTouch Core from SourceForge. Operating System: Windows, Linux.

248. Okatea

Modular, PHP-based Okatea describes itself as "a compromise between simplicity and flexibility." It boasts a modular architecture which allows users to add features for news, contact forms, etc. Operating System: OS Independent.

249. Orchard

This ASP.NET-based CMS is modular and highly extensible, making it easy to add blogs, photos and much more. The project has several international communities, and Microsoft staffers are involved in the project. Operating System: Windows.

250. Plone

Calling itself "the ultimate enterprise CMS," Plone offers integration with many other enterprise tools including Salesforce and other CRM solutions, Oracle, continuous integration tools, and many Web services. Paid support and other services are available through third-party providers. Operating System: Windows, Linux, OS X

251. Pimcore

This award-winning CMS claims to be "the industry’s first integrated open-source e-commerce & product information management platform for delivering rich and compelling e-commerce (B2C/B2B) experiences across all available channels." Paid support, training and add-ons can be purchased through the site. Operating System: Linux, Unix

252. SEOToaster

This solution claims to be "the most advanced SEO CMS and ecommerce website builder." It offers hub and spoke marketing technology that allows users to manage localized websites from a centralized interface. Operating System: OS Independent

253. SilverStripe

Created by developers in New Zealand, SilverStripe is both an open source CMS and a development firm that provides a variety of related services. SwipeStripe adds ecommerce capabilities to SilverStripe sites. Operating System: OS Independent

254. TikiWiki

TikiWiki calls itself "Groupware" because it offers features like blogs, forums, an image gallery, map server, bug tracker and feed reader to standard wiki capabilities. The software is completely open source, but support, consulting, hosting and other services are available through third-party partners listed on the site. Operating System: OS Independent

255. TWiki

As a structured wiki, TWiki combines the benefits of a wiki with the benefits of a database. It can be used for project management, document management, as a knowledge base, or to collaborate on virtually any type of content for intranets or the Internet. Operating System: OS Independent.

256. TYPO3

Installed more than 500,000 times, TYPO3 is a widely used enterprise CMS with multisite functionality, excellent scalability, granular permissions, multi-channel content publishing and more. Paid support is available. Operating System: Windows, Linux, Unix

257. WebGUI

Used by thousands of organizations, WebGUI offers capabilities like wikis, online surveys, news feeds, event management, message boards, shopping carts, blogs and more. Several third-party partners offer related services. Operating System: Windows, Linux/Unix, OS X

258. Wolf CMS

This newer CMS prides itself on being lightweight, fast and easy to use. However, note that it is easiest to use if you have some PHP coding skills. Operating System: Windows, Linux

259. XOOPS

Another very popular content management system, XOOPS has won several awards. It boasts a modular architecture, SEO features, excellent security, dynamic editing, email notifications and more. Operating System: OS Independent

260. XWiki

Most wiki software falls a little short when it comes to meeting marketing needs, but XWiki is a very full-featured platform with more advanced capabilities than most other open source projects of its kind. It supports blogging, reporting and the creation of simple Web applications, all of which can be useful to marketing teams. It comes in both a free and a paid enterprise version. Operating System: OS Independent.

261. Yellow

Yellow's claim to fame is its simplicity: "Just files and folders...Not much to learn." It's best for simple blogs and wiki-style websites. Operating System: OS Independent.

Customer Relationship Management (CRM)

262. CiviCRM

Similar to Orange Leap, CiviCRM was particularly designed for advocacy groups, NGOs and non-profit organizations with similar needs. It includes modules for case management, fundraising, event management, membership management, e-mail communications and marketing, and it integrates with both Drupal and Joomla. Operating System: OS Independent

263. ConcourseSuite

In addition to its features for sales and customer service teams, this Web-based CRM solution includes multiple features for marketers, including lead tracking, targeted email campaigns and survey capabilities. In addition to the open source version, a paid, supported version is also available. Operating System: Windows, Linux, OS X.

264. openCRX

This full-featured CRM solution combines groupware functionality (email, calendar and contacts) with sales force automation, marketing automation, customer service and analytics features. Paid support and custom development are available through partners. Operating System: OS Independent

265. SplendidCRM

SplendidCRM calls itself "the clear and obvious choice for companies that prefer Microsoft IIS to Apache and SQL Server to MySQL." It's a Windows-based CRM solution that comes in multiple cloud and on-premise versions. Operating System: Windows.

266. SugarCRM

Used by more than 1.5 million people in 120 countries, SugarCRM is an extremely popular, award-winning open source CRM solution. The website link above is primarily devoted to selling cloud-based subscriptions, but you can find the open source version at SugarCRM.com/download. Operating System: Windows, Linux, OS X.

267. vTiger

Downloaded more than four million times, vTiger comes in both cloud and open source versions. Key features include contact management, opportunity management, email marketing, forecasting, collaboration, workflow automation, reporting and mobile apps. Operating System: Windows, Linux, iOS, Android.

268. X2Contacts

This CRM tool gives marketers the ability to capture Web leads, track Website visits, draft and track emails, and automate and manage campaigns. It comes in a cloud-based version that runs on AWS or in an open source version. Operating System: Windows, Linux, OS X

269. Blazegraph

Formerly known as "Bigdata," Blazegraph is a highly scalable, high-performance database. It is available under an open source or a commercial license. Operating System: OS Independent.

270. BlinkDB

Still an alpha release, BlinkDB is a "massively parallel, approximate query engine for running interactive SQL queries on large volumes of data." In some tests it performed up to 200 times faster than Hive. Operating System: Windows, Linux

271. Cassandra

Created by Facebook, this NoSQL database counts Apple, CERN, Comcast, eBay, GitHub, GoDaddy, Hulu, Instagram, Intuit, Netflix, Reddit and other tech companies among its users. It supports extremely large data sets and boasts very fast performance and excellent durability and elasticity. Support is available through third parties. Operating System: OS Independent

272. CockroachDB

The team behind this project is working to create a database that is just as hard to kill as a cockroach is—in other words, it's extremely resilient. It also spreads like cockroaches—in other words, it's highly scalable. Operating System: Docker

273. CouchDB

Built for the Web, CouchDB is a NoSQL database that stores data in JSON documents which can be queried via HTTP and manipulated with JavaScript. Cloudant, which is now owned by IBM, offers a professionally supported version of the software, which is used by Samsung, Akamai, Expedia, Microsoft Game Studios and other companies. Operating system: Windows, Linux, OS X, Android

274. Drill

Apache Drill allows users to use SQL queries for non-relational data storage systems. It supports a range of NoSQL and cloud-based data storage systems, including HBase, MongoDB, MapR-DB, HDFS, MapR-FS, Amazon S3, Azure Blob Storage, Google Cloud Storage and Swift. It also allows users to search through multiple datasets stored with different technologies using a single query. In addition, it supports many popular BI tools. Operating System: Windows, Linux, OS X.

275. Firebird

This mature database has been around since 1981. According to its website, it offers "excellent concurrency, high performance, and powerful language support for stored procedures and triggers." Operating System: Windows, Linux, Unix, OS X, Solaris

276. FlockDB

Developed by Twitter, FlockDB is a very fast, very scalable graph database that is good at storing social networking data. While it is still available for download, the open source version of this project has not been updated in quite a while. Operating System: OS Independent.

277. GridGain

Powered by Apache Ignite, GridGrain offers in-memory data fabric for fast processing of big data and a Hadoop Accelerator based on the same technology. It comes in a paid enterprise version and a free community edition, which includes free basic support. Operating System: Windows, Linux, OS X.

278. HBase

Designed for very large tables with billions of rows and millions of columns, HBase is a distributed database that provides random real-time read/write access to big data. It is somewhat similar to Google's Bigtable, but built on top of Hadoop and HDFS. Operating System: OS Independent.

279. Hibari

This Erlang-based project describes itself as "a distributed, ordered key-value store with strong consistency guarantee." It was first developed by Gemini Mobile Technologies and is used by several telecommunications carriers in Europe and Asia. Operating System: OS Independent.

280. Hive

Apache Hive is the data warehouse for the Hadoop ecosystem. It allows users to query and manage big data using HiveQL, a language that is similar to SQL. Operating System: OS Independent.

281. Hustle

Hustle describes itself as "A column-oriented, embarrassingly distributed relational event database." Based on Disco, it's designed to offer extremely fast queries for very large data sets. Operating System: Linux.

282. Hypertable

Used by eBay, Baidu, Groupon, Yelp and many other Internet companies, Hypertable is a Hadoop-compatible big data database that promises fast performance. Commercial support is available. Operating System: Linux, OS X.

283. Impala

Cloudera claims that its SQL-based Impala database is "the leading open source analytic database for Apache Hadoop." It can be downloaded as a standalone product and is also part of Cloudera's commercial big data products. Operating System: Linux, OS X.

284. Infinispan

A Red Hat JBoss project, Java-based Infinispan is a distributed in-memory data grid. It can be used as a cache, as a high-performance NoSQL database, or to add clustering capabilities to frameworks. Operating System: OS Independent.

285. InfluxDB

InfluxDB is a "distributed time series database with no external dependencies." That makes it ideal for collecting data from IoT sensors; in fact, it can track data from tens of thousands of sensors sampling more than once per second. Operating System: Linux, OS X

286. Kexi

Part of the Calligra office productivity suite, Kexi is a visual database application creator similar to Access and Filemaker Pro. Note that it offers better support for Linux than for Windows or OS X. Operating System: Windows, Linux, OS X

287. LucidDB

The LucidDB website claims that this database is "the first and only open-source RDBMS purpose-built entirely for data warehousing and business intelligence." It is written partially in Java and partially in C++ in order to combine high performance with ease of development. Operating System: Windows, Linux, OS X

288. MongoDB

Used by Foursquare, Forbes, Pebble, Adobe, LinkedIn, eHarmony and others, MongoDB is a NoSQL database that claims to be "optimized for mission-critical deployments." Paid professional and enterprise versions are available. Operating system: Windows, Linux, OS X, Solaris

289. MySQL

Beloved by Web companies like YouTube, PayPal, Google, Facebook, Twitter, eBay, LinkedIn, Uber and Amazon, MySQL calls itself "the world's most popular open source database." It comes in multiple paid version as well as the free community version, and the latest update claims to be three times faster than its predecessor. Operating System: Windows, Linux, Unix, OS X

290. Neo4j

The self-proclaimed "world's leading graph database," Neo4J is used for fraud detection, recommendation engines, social networking, master data management and more. It users include eBay, Walmart, Cisco, HP, Accenture, CrunchBase, eHarmony, Care.com and many other organizations. Operating System: Windows, Linux

291. OrientDB

This multi-model database combines some of the capabilities of a graph database with some of the capabilities of a document database. Paid support, training and consulting are available. Operating system: OS Independent.

292. PostgreSQL

PostgreSQL calls itself "the world's most advanced open source database" and boasts more than 15 years of development. It has won multiple awards and offers excellent reliability and stability, even in high-volume environments. Operating System: Windows, Linux, OS X

293. Riak

"Full of great stuff," Riak comes in two versions: KV is the distributed NoSQL database, and S2 provides object storage for the cloud. It's available in open source or commercial editions, with add-ons for Spark, Redis and Solr. Operating System: Linux, OS X.

294. Realm

With an impressive roster of users that includes Google, Amazon, Starbucks, eBay, Budweiser, SAP, BC, Intel, Intuit, McDonalds, Walmart and IBM, Realm boasts that hundreds of millions of people rely on its mobile database. iOS, Android and Java versions are available for freel; enterprise versions are available for a fee. Operating System: Windows, Linux, OS X, iOS, Android

295. Redis

Now sponsored by Pivotal, Redis is a key-value cache and store. Paid support is available. Note that while the project doesn't officially support Windows, Microsoft has a Windows fork on GitHub. Operating System: Linux.

296. WebScaleSQL

Based on MySQL, WebScaleSQL is a collaboration among Facebook, Google, LinkedIn and Twitter. Their goal is to create a SQL database that can offer the performance, reliability and scalability that these large Web companies need. Operating System: Windows, Linux, OS X.

Data Destruction

297. BleachBit

BleachBit can securely delete files from a standalone system. In addition, it can clean up systems and improve performance by erasing cached files, temporary files, logs and other unnecessary data. Operating System: Windows, Linux

298. Darik's Boot And Nuke

Also known as DBAN, Darik's Boot And Nuke can completely eliminate all data from a hard drive. The open source version is designed for personal use, and a commercial version that can erase RAID arrays is available through Blancco, the project owner. Operating System: OS Independent

299. Eraser

For Windows only, Eraser deletes data from hard drives and overwrites it multiple times so that it cannot be recovered. It can destroy data on an entire drive or wipe out specified files and folders, and it includes a customizable scheduler. Operating System: Windows

300. FileKiller

Another secure deletion tool, FileKiller gives users the option of specifying how many times deleted data is overwritten. It promises fast performance. Operating System: Windows

Data Integration

301. Apatar

Apatar aims to make it easy to move data between on-premise and cloud-based applications, and it includes connectors for Salesforce.com, SugarCRM, and Goldmine CRM. It also comes in an on-demand version that integrates data from Salesforce.com and QuickBooks. Operating System: OS Independent.

302. Clover ETL

The Community Version of this extract, transform, load (ETL) tool can handle "modest" data transformation and ETL jobs. It also comes in paid Designer, Server Standard, Server Corporate and Server Cluster versions. Operating System: OS Independent.

303. DataCleaner

This enterprise-class tool can monitor your data, verify it against internal or external reference data, analyze your data quality, and find and merge duplicate entries. In additional to the free Community version, the company also offers commercially supported Professional and Enterprise editions. Operating System: OS Independent

304. GeoKettle

Based on Kettle/Pentaho Data Integration, GeoKettle incorporates geospatial capabilities from a variety of other open source tools. It is owned by Spatialytics, which offers commercial versions of the tools. Operating System: Windows, Linux, OS X

305. Karma

Developed at the University of Southern California, Karma can integrate data from databases, spreadsheets, delimited text files, XML, JSON, KML and Web APIs. It aims to be easy to use, and the website includes a number of videos showing its capabilities in action. Operating System: OS Independent.

306. KETL

KETL calls itself "a premier, open source ETL tool" and boasts that its features "successfully compete with major commercial products." Commercial support is available through Kinetic Networks. Operating System: Linux, Unix.

307. Kettle

Also known as Pentaho Data Integration, Kettle promises "powerful Extraction, Transformation, and Loading (ETL) capabilities, using a groundbreaking, metadata-driven approach." It features a drag-and-drop interface and scalable architecture. Operating System: Windows, Linux, OS X

308. MailArchiva

MailArchiva stores enterprise e-mail messages, allowing companies to meet compliance requirements, to search old messages quickly, to monitor content and to save on storage costs. The link above will connect you with the enterprise and ISP versions of the software; for the open source version, see SourceForge. Operating System: Windows, Linux.

309. Talend Open Studio

Talend is managed by a for-profit company rather than a foundation. As a result, paid support is available. Talend offers a mix of free and paid products. Its free, open source solution is called Talend Open Studio, and it has been downloaded more than 2 million times.

Market research firm Gartner recently named Talend a "Leader" in data integration. The company boasts that it can help enterprises analyze their big data five times faster and at one-fifth the cost compared to competing solutions. Operating System: Windows, Linux, OS X.

Data Loss Prevention

310. MyDLP

This robust DLP solution can "monitor, discover and prevent data leakage on your company network and endpoints." In addition to the free community version, it also comes in a supported enterprise version. Operating System: Windows, Linux, VMware.

Data Mining

311. DataMelt

The successor to jHepWork, DataMelt can do mathematical computation, data mining, statistical analysis and data visualization. It supports Java and related programming languages including Jython, Groovy, JRuby and Beanshell. Operating System: OS Independent.

312. KEEL

Short for "Knowledge Extraction based on Evolutionary Learning," KEEL is a Java-based machine learning tool that provides algorithms for a variety of big data tasks. It's also helpful for assessing the effectiveness of algorithms for regression, classification, clustering, pattern mining and similar tasks. Operating System: OS Independent.

313. Mahout

An Apache Foundation project, Mahout is an open source machine learning framework. According to its website, it offers three major features: a programming environment for building scalable algorithms, premade algorithms for tools like Spark and H2O, and a vector-math experimentation environment called Samsara. Companies using Mahout include Adobe, Accenture, Foursquare, Intel, LinkedIn, Twitter, Yahoo and many others. Professional support is available through third parties listed on the website. Operating System: OS Independent.

314. Orange

Orange believes data mining should be "fruitful and fun," whether you have years of experience or are just getting started in the discipline. It offers visual programming and Python scripting tools for data visualizations and analysis. Operating System: Windows, Linux, OS X.

315. RapidMiner

RapidMiner claims to be the "#1 open source data science platform," and Gartner named it a leader in its Magic Quadrant report for advanced analytics. It enables self-service predictive analytics and promises lightning-fast performance. Its users include BMW, Lufthansa, Domino's Pizza, Sony, Ford, Salesforce, Amnesty International and GE.

The complete RadiMiner Platform includes three separate pieces: RapidMiner Studio, RapidMiner Server and RapidMiner Radoop. All three are available under open source or commercial licenses, and commercial prices depend on the number of users. Operating System: OS Independent.

316. Rattle

Rattle stands for "R Analytical Tool To Learn Easily." It provides a graphical interface for the R programming language, simplifying the processes of creating statistical or visual summaries of data, creating models and performing data transformations. Operating System: Windows, Linux, OS X.

317. SPMF

SPMF now includes 93 algorithms for sequential pattern mining, association rule mining, itemset mining, sequential rule mining and clustering. It can be used on its own or incorporated into other Java-based programs. Operating System: OS Independent.

318. Weka

The Waikato Environment for Knowledge Analysis, or Weka, is a set Java-based machine-learning algorithms for data mining. It can perform data pre-processing, classification, regression, clustering, association rules and visualization. Operating System: Windows, Linux, OS X.

Data Visualization

319. Aperture JS

This project was designed to help produce visualizations of data to aid analysts and other decision makers. It's a JavaScript library that takes a "unified layer based approach to visualization assembly" in order to create rich, powerful graphics. Operating System: OS Independent.

320. D3.js

Short for Data-Driven Documents, D3 makes full use of newer Web standards to help users create interesting graphs and diagrams of their data. It grew out of the older Protovis project, and has been gaining more attention in the last couple of years. Operating System: Windows, Linux, Mac, iPad

De-duplication

321. Opendedup

Opendedup performs inline de-duplication to reduce storage utilization by up to 95 percent. It's available as an appliance for simplified setup and deployment. Operating System: Windows, Linux