Project Zomboid is a 3D top down isometric sandbox survival zombie game.
7 Days to Die is a voxel based survival horror game that costs $24.99 and is currently in Early Access.
You play as Wilson the Scientist in Don't Starve, this tough wilderness survival game blends science and magic as you try to survive long enough to escape. Don't Starve has a very unique hand drawn art style and with permadeath or only one life per game it really ratchets up the tension.
Darkwood is a procedurally generated open world survival horror game for PC that costs $14.99.
State of Decay is a third person action zombie survival horror game.