Quake - Quake is a series of first-person shooter video games released by id Software.
Left 4 Dead 2 - Left 4 Dead 2 remains the co-operative zombie adventure with all new characters, locations, enemies and also weapons to change in the popular game-play introduced in the unique Left 4 Dead.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Call of Duty: Black Ops - Call of Duty: Black Ops is an Action, Single-pl, and Multiplayer First-person Shooting video game developed by Treyarch and published by Activision.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Fallout - Fallout is an Action Role-playing, Isometric, Open World, Adventure, Sci-fi and Single-player video game developed and published by Interplay Entertainment.