These are a few apps that I have written that are TUIO compliant and work well with the BBTouch tracker (tho they should work with any TUIO tracker). they are written for Mac OS X 10.5 or better.

More Info: http://benbritten.com/blog/category/multitouch/

This Project uses the BBOSC project: http://code.google.com/p/bbosc/

Also related:

BBTouch: http://benbritten.com/blog/bbtouch-quick-start/

BBTouch is part of the opentouch project: http://code.google.com/p/opentouch/