Listed in this category are software that qualify under the Open Source Definition or the criteria used by the Open Source Initiative to determine if a particular software license can be considered open source or not. Almost all open source software are free but not all freeware and free software are open source.
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Better Codes
Open source software development network, aiming to bring like minded coders around the world together to collaborate.
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The Document Foundation
Produces LibreOffice, a vendor-independent open-source office suite; includes details of the project and their products.
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GNU Operating System
Launched in 1984 to develop a complete UNIX style operating system which is free software: the GNU system.
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GnuWin32
Features a software that provides Win32-versions of GNU tools. Also includes a list of the characteristics of GnuWin32.
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Launchy
Open source Windows application allowing for one click launches of commonly used programs.
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My Open Source
A guide to open source application software for the Microsoft Windows platform.
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Open Chrome
Offers information on documentation, source code, releases, bug tracking, binary packages and mailing lists.
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Open Journal Systems
Journal management and publishing system developed by the Public Knowledge Project. Includes information on downloads, documentation, screenshots, FAQs, research and publications.
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Open Office
Offers downloads of this open source office suite, first produced as StarOffice, later sponsored by Sun Microsystems, now acquired by Oracle.
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Open Source Windows
Simple list of open source software available for Windows sorted by category.
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PortableApps.com
Features a freeware that enables users to transport their data and settings to any Windows-based computer.
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Schoolforge
Provides information on the school's advocacy, usage, and development of open resources for primary and secondary education.
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SourceForge
Open source software providing mailing lists, bug tracking and online forums.
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TridiaVNC
Software allows a user to view and control the remote screen, keyboard, and mouse of a host machine.