Deluge is a fully-featured cross-platform BitTorrent client. It is Free Software, licensed under the GNU GPLv3+ and adheres to freedesktop standards enabling it to work across many desktop environments.
GTK-gnutella
gtk-gnutella — это сервер/клиент для одноранговой сети Gnutella.
Тиксати
Tixati — новая и мощная P2P-система