This is a game engine for 2D side-scrolling action/adventure games for Mac OS X. It has been used extensively as part of the Power Game Factory game creation software (http://www.sawbladesoftware.com)
I've worked with many game creation tools in the past but PGF can't be beat. If you've ever played Soulless it's powered by this very engine.
Great idea... but the price is a little too high for me...
too much money dude