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. There are 17 unique player models to choose from and 12 weapons.
Good game, needs work. even on the hardest difficulty level it is too easy. Bots look like they are floating instead of walking or running.