Dead frontier,definitely.
DayZ
Zombie Pandemic
Die2nite
avoid WarZ ( a lot of problems around that game)
check link for more details and a bigger list of zombie mmo games
http://www.zombieplace.com/zombie-mmo
There is Dead Frontier which is a free online 3D zombie mmo, Zombie Pandemic, Day Z (strongly recommend) and many many more just check the zombie mmo link down below for more info on these and other mmo games p.s. the first link (zombie mmo rpg) is someone farming for in game credits so beware!
There are plenty of MMO zombie games out there. Dead Frontier is probably the one you're looking for, you should definitely check it out. For other similar games,
A really good MMO in my opinion is Forsaken World or Warhammer.
As of 2013, there are fifteen of the good adventure FTP MMO suggested online. Some of the names of the good adventure FTP MMO that are suggested are Eden Eternal, Grand Fantasia, and Age of Conan: Unchained.
aq.com is a good one
nothing
i did is so good
There are many places one might play MMO (or better known as MMOG) games. The "Free MMORPG List" website or "MMO Bomb" websites would be a good place to begin.
try Pokemon indigo at: http://www.pokemonindigo.com/
for consule there really isn't a zombie RPG game but theres an MMO game called DeadFrontier on the internet. Google it, make an account, and stuff. i am planning on making a game with HUGE free roam thing. like going all across America during a zombie attack
depends how u like it :p there is alot of brower mmo's one of the best i think is Runescape but try out Aqworld Battleon Dragonfable
1. RuneScape 2. Lord of the Rings Online