Penetration testing

An anonymizer or an anonymous proxy is a tool that attempts to make activity on the Internet untraceable. It is a proxy server computer that acts as an intermediary and privacy shield between a client computer and the rest of the Internet. It accesses the Internet on the user's behalf, protecting personal information by hiding the client computer's identifying information.^{[1]
http://en.wikipedia.org/wiki/Anonymizer}
http://somebody.net/services.html

Best Free Internet Anonymizers
http://webwarper.net/
https://www.megaproxy.com/
http://www.w3privacy.com/
http://www.anonymizer.ru/
http://www.the-cloak.com/
http://www.psurf.net/
http://anonymouse.ws/
http://easysecurity4u.com/
http://hotsurflive.com/
http://newanonymous.com/
http://nu3ga.com/
http://www.guardster.com/
http://www.proxyweb.net/
http://www.long999.com/
http://www.phproxy.info/
http://www.proxy121.com/
http://www.livreproxy.com/
http://www.hidemyass.com/
http://www.shadowsurf.com/
http://www.proxyforall.com
http://proxify.com/
http://www.snoopblocker.com/
http://www.online-proxy.net/