http://dds6qkxpeiqvogt4y2fd7vtsxq6pvokekb2h4la7jd4iwl4ljuawu5qd.onion/wiki/Dev/Technical_Introduction
Whonix can also potentially and optionally use other anonymizing networks (Such as JonDo, I2P, Freenet, RetroShare), either in addition ( tunneled through Tor) or as a replacement for Tor. See the article for more information.