assaflehr··on Extreme Motion SDK – Add motion experiences to existing applicationsdon't think there are any (but if you know a good one, do post!) And this one is based of Rev-Share so it`s pretty simple business model even for indie-games.
assaflehr··on Sdk for realtime tracking the head, hands and body in softwareif you are a game developer (indie or not), it`s worth looking into this one.