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.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
mGSTEP port of the Cube game engine
Clone of Urban Assault with new Graphics.
OpenKore is an automation tool for Ragnarok Online
A 2D Platformer Shooter game
Viewer for Second Life and OpenSim virtual worlds
The All-in-One music game
Your death sentence awaits...
Free 3D Roguelike action RPG
Opensource RTS game
Frontend for Minecraft Server