True SURVIVAL Zombie Horror - Project Zomboid
Surviving isn’t just about blowing off zombie heads. Depression, starvation, loneliness, illness, insanity. These are just some of the things you have to deal with…And that's what makes PZ stand out. The game is technically still in alpha, but it's totally playable (and in multiplayer), and available both on Steam and Desura.
Let's get this part straight right off the bat: This game is about survival. And, well, the title card puts it pretty succinctly:
It's well worth the $15 in the state that it is now, but the developers are still hard at work on it. Check it out.