Trackmate

For working with tangible interfaces, reactivision has been mentioned as an open source solution. For my project I am using Trackmate, a similar solution that came out of the MIT Media Lab. Trackmate can work with a number of programing languages, including processing. Trackmate uses makers similar to reactivision, which are places on objects to be tracked. Below is a sample marker and video demo.

Linking webpages to people with Trackmate from adam kumpf on Vimeo.