System Shock - System Shock developed by Night Dive Studios.

Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.

Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.

Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.

Killzone: Shadow Fall - Killzone: Shadow Fall is offering thrilling gameplay, in which you, as the protagonist, need to complete a variety of challenging missions.

Quake - Quake is a series of first-person shooter video games released by id Software.