Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Arma - Experience true combat gameplay in a massive military sandbox.
Quake - Quake is a series of first-person shooter video games released by id Software.
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.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Playerunknown’s Battlegrounds - Playerunknown’s Battlegrounds is an Action-Adventure, Third-person Shooter, Survival and Massively Multiplayer Online Role-playing video game created and published by PUBG Corp.