Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
PicoTorrent - PicoTorrent is designed to be a tiny, easy-to-use BitTorrent client with low memory usage.
FrostWire - Easy to use BitTorrent Client and YouTube Downloader in one, with built-in search and music library.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.
Transmission - Transmission has the features you expect in a BitTorrent client: encryption, a web-based interface...