7 Days To Die

7 Days To Die is a survival crafting game with a huge world. You start as a survivor with no equipment or even clothing, and must survive for as long as possible by taking care of your needs and fighting back the infected. You can build, craft new tools and weapons, and even go mining! It's an all in one packed to the brim with fun.

Cataclysm: Dark Days Ahead

Cataclysm: Dark Days Ahead, is a free ASCII (or with a tileset) open source, zombie based, rogue-like, set in a post-apocalyptic New England. You begin the game as a survivor in a scenario of your choice in a randomly generated world, from then on, your only task is to survive and eventually be free to do whatever you want, like to build a base and custom vehicle, or even become a mutated, solar powered, mess. This game is very open to do almost anything, except first; you must survive.

S.T.A.L.K.E.R Trilogy

S.T.A.L.K.E.R  was a revolutionary first person shooter game set in an open world taking place in Ukraine Chernobyl, the site of a nuclear disaster, populated by bandits, the military, loners and mutants. You fight your way through hordes of enemies to do what you set out to do, And nothing will stop you.