The Never-Ending Drawing Machine produced by David Robert & colleagues at MIT Media Lab is a collaborative creativity station that enables users to co-create and edit each other's tangible, paper sketchbooks in real-time.
The Never-Ending Drawing Machine is built in TouchDesigner, a visual programming environment made by Derivative. The software provides the framework for integrating various subsystems.
TouchDesigner is available free for non-commercial use and can be downloaded at derivative.ca. See full article at derivative.ca/Events/2010/NEDM