Tor

Tor (The Onion Router) is a free software implementation of second-generation onion routing &mdash; a system enabling users to communicate anonymously on the Internet. Originally sponsored by the United States Naval Research Laboratory, Tor became an Electronic Frontier Foundation (EFF) project in late 2004, and the EFF supported Tor financially until November 2005. The Tor software is now developed by the Tor Project, a research/education, non-profit organization that receives a diverse base of financial support.