Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.

7 Days to Die - 7 Days to Die is a post-apocalyptic survival game, during which players must craft shelters and horde resources in order to survive waves of undead enemies. Read more about 7 Days to Die.

Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.

The Forest - The Forest is a Horror-Survival game with strong Action-Adventure, First-person Perspective, Sandbox, Co-op, Single and Multiplayer Shooting video game by Endnight Games Ltd.

Quake - Quake is a series of first-person shooter video games released by id Software.

Dead Frontier - Dead Frontier is among the few zombie based video games that you can obtain in your web browser and for free.