OfxBlackBox is a project mainly written in C and C++, it's free.
Minimal aesthetic orientation GUI for openFrameworks with MultiTouch/TUIO compatibility
ofxBlackBox by Patricio Gonzalez Vivo ©2010 http://www.patriciogonzalezvivo.com
Despite the cheesy name, the goal was to make an addon for openFrameworks with a minimalist aesthetic orientation. It is fully compatible with TUIO and objects can be dragged, resized, and rotated with two fingers. Making a good alternative as an interface to multitouch projects