From the link:
Large swaths of the world are subject to censorship, or else track their citizens’ use of the Internet. Free program Freenet lets you anonymously browse the Web, share files, chat on forums, and more–no matter where you are. Download and run the software, and you become part of a decentralized P2P network that uses encryption and other tools to keep you hidden and anonymous. As you browse, your data is encrypted and sent through a series of Freenet nodes, making it very difficult to track you.