Players are able to control both the playing characters AND the dungeon master, and they choose which battles to fight. Put together a bunch of monsters to make for a challenging fight, your efforts will be equally rewarded!"
Knights of Pen and Paper looks really interesting. It boasts launch support on Windows, Mac, Linux, Android and iOS which is pretty awesome. Having someone play AS the Dungeon Master that facilitates the game sounds very cool. I would be very interested in getting people together to play this online after it drops if its fun.
http://www.paradoxplaza.com/games/knights-of-pen-and-paper-1-edition