Two really great apps are free this week. First up, Knights of Pen and Paper is an (in my opinion) underrated and very charming turn-based RPG, with the unique premise that you're actually playing an old pen and paper role-playing game, complete with a dungeonmaster describing every environment you enter and NPC you come across. Or you can play DM yourself, and design an adventure for your gamers. The game is on iPhone and iPad, so more users than ever have a chance to download and enjoy it.
And on the complete other end of the spectrum from underrated, the original Angry Birds app (
