Two-hour wargames' All things zombie the final fadeout (or something along those lines) is really popular. It isn't for everyone, but those that do play it, mostly like it.
Then you have the No more room in Hell from Iron Ivan's games. I have this one and while it has it all (vehicles, lawn mowers on those vehicles

, lotsa guns, different kill chnace for zed and human...) I just can't get myself to like it. But I still couldn't point my finger to what is bothering me, perhaps the system.
You also got AR:SE, Akula's rules and Dead walk again (both free)
If you need info on zombie wargaming, you really can't go wrong with
http://boardofthelivinglead.proboards.com/