Quake - Quake is a series of first-person shooter video games released by id Software.
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Elite Dangerous - Elite Dangerous is a 2015 Trading, Action, Sci-fi, Exploration, Open World and Space Simulation by Frontier Developments.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Star Conflict - Star Conflict is a free MMO action game and space simulator that was introduced in 2012.