Freenet

Freenet is a decentralized P2P application developed in Java that is known for guaranteeing the anonymity of users when encrypting communications that are produced between the nodes of the network, and for being administered through a web interface.

To access the service that offers Freenet, users must share with the rest of the community their bandwidth and a small part of their hard drive. You can indicate on Freenet's configuration assistant the amount of disk space you're willing to share.

The stored files on the disk administered by Freenet are encrypted, which is why it's practically impossible to know their contents.

Freenet isn’t just a network for sharing files, but also can be used to publish web sites anonymously that won’t be affected by censorship, to send email messages, create a forum discussion, etc.