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.
An amazing evolution of a classic! I own the originals, long operational on Linux, and now operational on all systems! Hats off to the devs!