DreaMule!

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 OpenSSL to encrypt all communication.

MLDonkey is an open source, multi-protocol, peer-to-peer file sharing application that runs as a back-end server application on many platforms. It can be controlled through a user interface provided by one of many separate front-ends, including a Web interface, telnet interface and over a dozen native client programs.Its great when you have multple computers and you want to set up one server to download and in multiple computers with multiple users you can add files. (use it with Sancho Gui)

Simple and easy to useFully decentralized networkAll shared files are indexed locallyNo relaying of other user's searchesPure UDP protocol that utilizes forward error correctionFull connection encryption and decentralized public key infrastructureRecirculating token system that helps distribute upload bandwidth fairlyEfficient and fast transfers via re-combining and re-encoding blocks at all nodesClean install and uninstall, or stand-alone operation, with no annoying .Net or Java dependenciesNO Spyware NO Ads NO Nonsense »

Features morph adds to official eMule

eMule Plus is a new generation eye candy eMule compatible client created to improve the original GUI and to bring you the best experience ever. Give it a try and feel the boogie. eMule Plus does not contain any spyware, adware or the like. Its open source and free for life.

Quazaa is a cross platform multi-network peer-to-peer file-sharing client based on Shareaza which will support Gnutella2, Ares, eDonkey2000, HTTP, FTP, and BitTorrent.

Warez P2P is a proprietary peer-to-peer filesharing service released in January 2004.