DC++ - DC++ developed by Jacek Sieka.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
Kazaa - Kazaa is another peer-to-peer file sharing platform, use FastTrack protocol licensed by Joltid Ltd and operated as Kazaa by Sharman Network.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.