I recently joined the team over at Wolfpack-manor
They're working on a Zombie MMO FPS
It does something interesting things for one it doesn't start out " end of the world" but becomes it over time so you get to witness the changing events yourself.
It doesn't use re spawning resource mechanics which is awesome. Cause it means you'l have to search further and wider each time. Keep track of where you've been; putting yourself at more risk as you scavenge in area's you don't have proper knowledge of.
Well I don't want to write it all here but this is some great food for thought so go on guys check it out let them know we're interested.
Found here: Indiedb.com
