ofxLeapMotion and ofxBox2d
My mom purchased a LeapMotion right when they came out and used it a bit then gave it to me since she does the standard set of tasks on the computer and there wasn’t a compelling reason for her to use it. So I have had this LeapMotion for the past 6 months without any idea of how to use, so seems like a perfect chance to actually use it!
I have seen the classic use with the now build-in ofxKinect where you use your body to play with boxes. This is sort of in a similar vein where boxes and spheres are rained down from your finger tips.