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.

XFX41 says

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awesome game that actually runs unlike urban terror!. playdeb has the binary but it takes 10 hours to get it where as desura had .8.8 for OA out of the box ready to run