DayZ - DayZ is an open world multiplayer survival game that tosses you in the midst of a zombie apocalypse.
S.T.A.L.K.E.R. - S.
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.
F.E.A.R. - F.
Project Zomboid - The Ultimate Zombie Survival RPG.
Halo 3: ODST - Halo 3: ODST developed by Bungie and published by Microsoft Games Studios.