During my study Master Digital Environment Design we worked a lot with Mocolo (http://orfware.com) a motion tracking software, but this software is only available for Windows. So most of the times we would have a one PC running with a camera and Mocolo sending the data to the other machines where needed. With the software came a test client but also only for Windows so I made a clone of this software in Processing (http://processing.org) to use on the PC, Mac and Linux. If you only use the application be sure to use port 2000 otherwise just open the project in Processing and adjust according to your needs. You can download the MocoloTestClientP5 here You can find it also on the sketches page.