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.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Crossfire RPG Game Weather Patch -- Now a branch on the official repo!
Star Trek Web browser game
Advanced Wasteland mission using ACE for Arma II
Open Source Virtual World and MMOG Development Platform