TrueCombat: Elite is a free tactical-teamplay oriented, modern-world combat first person shooter (FPS) simulation game developed by Team Terminator and Groove Six Studios. The game is powered by the Quake III engine and is more focused on realism in combat. The game so far is supported on PowerPC Mac's which means that the game will not run on Mac OSX 10.7 (Lion) or newer.
Mac OS X 10.4 to 10.6 (10.7 or newer not supported)
Intel or PowerPC powered Mac
256 MB RAM
OpenGL compliant graphics card
Free download at truecombatelite.com