Provides a free anonymous web surfing service and a comprehensive list of resources for anonymous use on the internet. Registration required. Also offers anonymous webhosting. http://www.idzap.com/
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. http://www.onion-router.net/
Hides short messages in a fake spam; the recipient can decode them after receiving the real-looking "unsolicited commercial e-mail". http://www.spamMimic.com
Tool to clean out browser cache, browser history, address bar, data saved for form auto-completion, temporary files, and cookies. Requires browser to run an ActiveX component. As of 5/2002 still a test product, but free. http://www.anonywasher.com/