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.
The game is true to it's Quake 3 roots. Dark, fast and full of weapons! If thats the way you like your games then you'll love this game. Born from a classic and bound to be a classic.