Previously called the "QUAKE 3 Engine" and one of the most successful licensed engines in history, id Tech 3 was the engine used to create games such as Quake II Arena, Return to Castle Wolfenstein and Soldier of Fortune II: Double Helix. id Tech 3 introduced shaders, curved surfaces, 32-bit color, special effects, bleeding-edge networking and super-smooth speedy hardware rendering.
OpenArena 
OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag, Domination, Overload, Harvester, and more...
3 months ago, Released Aug 28, 2011 Multiplayer First Person Shooter
Quake III Arena
Welcome to the Arena, where high-ranking warriors are transformed into spineless mush. Abandoning every ounce of common sense and any trace of doubt, you lunge onto a stage of harrowing landscapes and...
7 months ago, Released Aug 27, 2011 Single & Multiplayer First Person Shooter
Return To Castle Wolfenstein
World War II rages and nations fall. SS head Himmler has Hitler's full backing to twist science and the occult into an army capable of annihilating the Allies once and for all. Battling alone, you're...
1 year ago, Released Sep 7, 2011 Single & Multiplayer First Person Shooter
Star Wars: Jedi Academy
A spin-off of Jedi Knight II: Jedi Outcast, Jedi Academy allows players to create their own Jedi, train in the Academy under the tutelage of Luke Skywalker and Kyle Katarn and ultimately choose to follow...
1 day ago, Released Oct 31, 2010 Single & Multiplayer First Person Shooter
Wolfenstein: Enemy Territory
Based on Return to Castle Wolfenstein's engine, Enemy Territory started as an additional single-player campaign, but quickly evolved into a massive on-line shooter in minds of creators. The final product...
1 year ago, Released Jan 22, 2012 Multiplayer First Person Shooter