Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Dota - Dota is an amazing, Massively Multiplayer Online Battle Arena (MOBA), Role-playing Combat and Defense video game developed by Valve Corporation.
Quake - Quake is a series of first-person shooter video games released by id Software.
Smite - Smite is an Awesome, Action, Free-to-play, Co-op, MOBA (Multiplayer Online Battle Arena), Survival, Third-person and Role-playing video game created and published by Hi-Rez Studios.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Heroes of the Storm - Heroes of the Storm is an Engaging, Action, Fantasy, Strategy, Multiplayer Online Battle Arena, Combat and Multiplayer video game created and published by Blizzard Entertainment.