TOR

TOR or The Onion Router is a web browser that can help users remain anonymous by bouncing their signal through several relay points, obfuscating where and who the interent traffic came from. TOR also allows for users to access .onion web addresses.

References:

Tor Browser Homepage -https://www.torproject.org/projects/torbrowser.html

Guardian article about NSA exploits of TOR- https://www.theguardian.com/world/2013/oct/04/tor-attacks-nsa-users-online-anonymity