www.torproject.org
Free
Tor (short for The Onion Router) is a combination of client software and a network of encrypted proxies and data routers that effectively defends against most kinds of network surveillance. By using it, you make it very hard for a third party to determine what Web sites you’re visiting and even who you are and where you’re located.
Most Internet communications are easily traceable: Each packet has the IP address of its source (you) and its destination (a Web site) in its header. However, the Tor client encrypts your packets and routes them to a random Tor node, which then routes them to another random Tor node, which then decrypts them and passes them on to their destination. Return communications follow a similarly random path. Yes, the system can be slow, as it relies on the bandwidth of volunteers for the nodes, but its popularity increases your anonymity further: Who can sort through all those packets to find just you?
Source of Information : CPU Computer Power User November 2010
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