Zombasite might be a little hard to wrap your head around but the blend of action RPG and Civilization-style strategy works really well. A little rough around the edges but the game underneath is a gem worth digging for.
Check the Zombasite if you want to try a less traditional Diablo-like RPG with added administration of clan villages. Once you get through the graphic design, you can expect long hours of discovering an interesting game with the cooperation possibility as an extra bonus.