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 attempt at updating an old ice map. New skybox, new weapon/item placement, some new structural features, you know the deal. Not too pleased with the lighting, though.