Zombie Survival Games?

Does anyone know of a pretty decent non browser zombie survival game out there? I dont mean like left for dead of COD zombies, i mean like a game where you have to get supplies to survive and build barricades daily to fend of the hordes. I have played fort zombie, that game could use a little work though. I have been looking for this certain game for awhile and nothing can live up to the standards. Its a good idea for a game i dont know why no one uses it