Odamex is a free, cross-platform, modern client-server Doom engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A 2D multiplayer space shooter game
Cross-platform real-time strategy game (3D)
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
Pinewood Derby Race Management
Map creator for the BattlleTech MUX
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
An HTML web game platform
Damage calculator and items comparison tool for Diablo 3
A 3D multiplayer RPG based in the world of Khoras.
Frontend for Minecraft Server