Crimsonland - Crimsonland.com - a top-down shooter with a touch of RPG: gain XP, choose perks, unlock weapons, and blast your way through aliens, zombies, and lizard men. Coming soon to Steam and PS4!
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Beyond Divinity - Beyond Divinity belongs to the Divine Divinity series and functions similar gameplay to the core role playing games in that series.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Neverwinter Nights - Neverwinter Nights brings you to a fantasy world in a 3rd person RP game.
Quake - Quake is a series of first-person shooter video games released by id Software.