Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Quake - Quake is a series of first-person shooter video games released by id Software.
Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
OpenArena - OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.