ZeroNet!

I2P is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties.

Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.

GNUnet is a framework for secure peer-to-peer networking that does not use any centralized or otherwise trusted services. A first service implemented on top of the networking layer allows anonymous censorship-resistant file-sharing. Anonymity is provided by making messages originating from a peer indistinguishable from messages that the peer is routing. All peers act as routers and use link-encrypted connections with stable bandwidth utilization to communicate with each other. GNUnet uses a simple, excess-based economic model to allocate resources. Peers in GNUnet monitor each others behavior with respect to resource usage; peers that contribute to the network are rewarded with better service. »

Project Maelstrom is a torrent-based distributed web browser developed by BitTorrent, Inc.It's a fork of Chromium that uses P2P to load torrents and render webpages.

Beaker is an experimental browser with peer-to-peer hosting that enables any user to create a site instantly and for free.

MUTE File Sharing is a peer-to-peer network that provides easy search-and-download functionality while also protecting your privacy.

Osiris is a free portal creation software. The portals created with Osiris don't need a central server; they are safe, indestructible and anonymous. In those portals, all users have the same rights, so the standard hierarchies (administrators, moderators, members) of regular forums are not present, even if they are supported.

Decent is an independent decentralized web 3.0 platform for creative people, authors, bloggers, publicists and their fans & followers allowing borderless publishing of any text, picture, video or music content.

dn42 is a big dynamic VPN, which employs Internet technologies (BGP, whois database, DNS, etc). Participants connect to each other using network tunnels (GRE, OpenVPN, Tinc, IPsec) and exchange routes thanks to the Border Gateway Protocol...

Ninux is an Italian wireless network community with the goal of creating and expanding a free, open and experimental computer network. It uses the OLSR (Optimized Link State Routing) Protocol, an IP routing protocol optimized for mobile ad hoc networks.