im not sure if zombies would count.. but any of the Resident evil games (2 and 4 remakes are my favourite) are really good and definitely some of my favourites!
Outlast seems pretty good from what I have heard and watched, even though its older. I really enjoyed the playthroughs I have watched of it though :]
Outlast and it's sequels are pretty good in my opinion. The realism kinda falls apart near the end of the first game, but it's still a great game with a great atmosphere.