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.
A remixed version of the base game's czest2ctf, also called "The Bridge of Despair". Has an all new weapon/item placement, tons of optimizations, and a new background.