Quake - Quake is a series of first-person shooter video games released by id Software.
Dead Frontier - Dead Frontier is among the few zombie based video games that you can obtain in your web browser and for free.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
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.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Tribes Ascend - Tribes Ascend is an Action and a Free First-person Shooter video game created and published by Hi-Rez Studios.