Dead Road: 8 completed episodes out of planned 11 are available for viewing.
Vitamin Z: Season 1 - 8 completed episodes.
The Zombie Apocalypse: 2 episodes; scroll down a little bit to see the episodes available.
The Last Stand: 5 episodes.
End of World: Just a trailer so far...
Chronicles of the Dead: A large collection of episodes, teasers, and behind the scenes videos.
I have not watched a single episode of any of these shows yet. I just linked to them as I ran across them and will view them later. Has anybody reading this watched these? I am sure there are even more zombie apocalypse web series out there. Do you have any recommendations?