Left 4 Dead 2 is a co-op first person shooter from Valve. In the game, 4 Survivors try to make it through multiple campaigns with different game modes by using a variety of weapons.
Project Zomboid is a 3D top down isometric sandbox survival zombie game.
7 Days to Die is a voxel based survival horror game that focuses on crafting and world building, all while having you take a hand at surviving in an undead filled post-apocalyptic world.
Dying Light is an open world, first person, action survival game with a four player co-op mode. It costs $59.99
The Walking Dead is an episodic adventure game that costs $24.99.