Desktop OS X Multi-Touch Framework Concept, Demo
Lux, a 3rd party framework developed by Christian Moore, provides "true multitouch interaction" in Mac OS X and other operating systems. Developed using Flash and C++ (flash for rapid development), Moore says the framework is open-source.
Apple's UITouch its very, very well designed. It runs at the core level, while ours is more a free environment to develop on top... to learn about multitouch and share code.