RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .
The I2P network provides strong privacy protections for communication over the Internet. Many activities that would risk your privacy on the public Internet can be conducted anonymously inside I2P.
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.
I2P (Invisible Internet Protocol) is a universal anonymous network layer. All communications over I2P are anonymous and end-to-end encrypted, participants don't reveal their real IP addresses.
Tribler is an application that enables its users to find, enjoy and share content. With content we mean video, audio, pictures, and much more. Tribler has three goals in helping you, the user: find, consume and share content.Warning
Host's IP can be used as exit nodes: it means that if some other user downloads something illegal, you could be prosecuted because your IP appears! Even on Tribler official website, a Disclaimer states: "Do not put yourself in danger. Our anonymity is not yet mature. Tribler does not protect you against spooks and government agencies."
Calypso, formerly Kommute, is a cross platfrom file sharing client using the anonymous network MUTE. Developped using C++ and Qt. For windows and linux, portable to other environments. You can try it by following the installation instructions below.
The project is no longer developed. Last version, 0.24, released in May 2010, can be still downloaded from the official website.
Perfect Dark is an anonymous peer to peer network which aims to become the #1 in Japan. You have to share at least 40 Gigabyte of your hard drive which is used for the networks exceptional storage system which works like a global RAID array.
MUTE File Sharing is a peer-to-peer network that provides easy search-and-download functionality while also protecting your privacy.
Latest version 0.5.1 released on April 23, 2007. See dates on http://mute-net.sourceforge.net/
ANts P2P realizes a third generation P2P net. It protects your privacy while you are connected and it makes you not trackable, hiding your identity (ip) and crypting everything you are sending/receiving from othersDiscontinued
10 years no release, abandoned project apparently