ePresence was an open source project maintained by the University of Toronto from 2001 to 2008. It has been forked and commercialized in 2008 by the lab ex-employees as a private enterprise. Please visit http://epresence.tv for further details.
This project is the result of an effort by NITLE ( http://www.nitle.org/) to integrate Marratech e-meeting functionality (via the public, exposed Java API) into the Moodle ( http://moodle.org/ ) OSS Learning Management System.