The warZ is similar to DayZ (arma 2 mod) but its in alpha stage, currently features:
-modifiable weapon (laser, supressor ect)
-infection (turn into a zombie 24H after infection but you can find/buy vaccin)
-maps around 200 and 400 km² wide
-food water needs
-sadly (extreme) PVP
-hardcore mod (permanent death)
-multiplayer only
-a shop that contain every item you can find in-game
-reviving coutdown (wait 30 min after you have been killed to revive your character (will lose its entire inventory))
-max weight and item gestion (find a better backpack if you want hold more item in your inventory)
-other
-vehicle (in futur update)

other info at : http://thewarz.com/