I just put up OpenArena for Linux, both the 32-Bit and the 64-Bit versions.
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.
OpenArena Indiedb.com