The Tor Project is probably the best-known privacy tools available today. This technically sophisticated project works using a kind of crowdsourcing: people who believe in the project install the software which hooks their internet address up to a global network of servers. Somebody – for example a whistleblower or political dissident can then send digital information through this encryption network. Tor divides the sent information up and sends the different portions by randomised routes through the network, meaning that even if some is intercepted, it will be both incomplete and will not bear any trace of the identity of the sender. Read a more in-depth description here.