Puzzle game to design and play cross sum games.

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Developer: crosssum
License: GNU General Public License (GPL)
Operating System: All POSIX (Linux/BSD/UNIX-like OSes)

A cross-platform, OpenGL-rendered Duke Nukem 3D port which provides many new features for mod authors.

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Developer: eduke32
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), OS Portable (Source code to work with many OS platforms)

Project Freedom is an open source cross platform first person shooter.

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Developer: freedomthegame
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), Linux

Hammer of Thyrion is a cross-platform port of Raven's Hexen II source.

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Developer: uhexen2
License: GNU General Public License (GPL)
Operating System: MinGW/MSYS (MS Windows), 64-bit MS Windows, All 32-bit MS Windows (95/98/NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), All POSIX (Linux/BSD/UNIX-like OSes), QNX, FreeBSD, Lin

The Irrlicht Engine is an open source high performance realtime 3D engine written and usable in C++.

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Developer: irrlicht.sourceforge.net
License: zlib/libpng License
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), WinCE, Linux, OS X, Solaris

Platform for PHP which has gambArt GUI framework for standalone desktop application development, Semok web application framework, and classes collection (distributed computing, networking, compression, byte compiler, SMS, XML, and database abstraction).

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Developer: Reza Iqbal
License: Common Public License
Operating System: Linux, Windows

FreePHPBlogSoftware is free blogging software powered by PHP scripting and a MySQL database.

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Developer: Dustin Cowell
License: GNU General Public License (GPL)
Operating System: Unix, Linux, Windows