BubbleDrum X for Mac

From Melonsoft:

BubbleDrum effectively incorporates power and functionality with a friendly, familiar user interface. This allows musicians as well as hobbyists and children to quickly begin jamming on their own custom drum set. Playing the drums has never been this free-flowing and creative. Move your drums to acceptable positions around BubbleDrum's Stage window, and then play them with the click of a mouse or via your computer's keyboard.
Create a drum set that you just love? You can save all of the drums on the Stage and then load it back in whenever you want.