Rust Game - Rust’s world is harsh. The environment is not kind. Bears and wolves will chase and kill you. Falling from a height will kill you. Being exposed to radiation for an extended period will kill you. Starving will kill you. Being cold will kill you.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Arma - Experience true combat gameplay in a massive military sandbox.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
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.
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.