LimeWire - LimeWire is a free peer-to-peer file sharing platform that is available to use on Windows, Mac OS and Solaris platforms.
Demonsaw - Demonsaw is the next leap in the evolution of a free Internet, and the debut of social cryptography.
eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
Jitsi - Open-source video calling and chat platform.
Phex - Phex is a peer-to-peer file sharing client for the Gnutella network.
Gajim - Full featured and easy to use Jabber client