Computers

Prevents a site from appearing in the server logs of referred pages as a referrer.

Free service to show web surfers how much information their browser can reveal about their system when visiting normal web pages.

Free Software to clear all browsing history tracks from your computer.

"A product of the US Navy Research Lab, the Onion Routing is an Internet based system to prevent eavesdropping and traffic analysis attacks. It is now ""off-line"" but listed in the ODP for completeness and potential new developments."

Hides short messages in a fake spam; the recipient can decode them after receiving the real-looking "unsolicited commercial e-mail".