0 A.D. is a free, open-source, cross-platform real-time strategy game.
Odamex is a free, cross-platform, modern client-server Doom engine
A 2D multiplayer space shooter game
Network gamepad/joystick
Cross-platform real-time strategy game (3D)
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
Snakes of Apocalypse is a funny multiplayer game
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
New version of PTkEI2, the cross-platform GUI client for Wolfpack Empi
A funny game for a good company similar to karaoke
Updated client for Battletech MUX game servers
Map creator for the BattlleTech MUX
Pinewood Derby Race Management
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Minecraft Name Availability Checker
Java decentralized cross-platform network multiplayer game engine
The Free Online Multiplayer Hacking Platform Shooter
SA:MP server administration filterscript
The All-in-One music game
A Simple and Easy to Use User Interface for Private Bukkit Servers
Flickit is fun 2d physics arcade style game.
Open Source Virtual World and MMOG Development Platform