Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Hexen II - The Hammer of Thyrion project is a cross-platform source port effort of Raven Software's Hexen.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Sven Co-op - Online co-op game based on Half-Life.
Rage - Rage Software, also Rage Games and FX Digital Network, was a British video game developer.