qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
libtorrent - libtorrent is a feature complete C++ bittorrent implementation focusing on efficiency and...
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.
rTorrent - rtorrent is a BitTorrent client for ncurses, using the libtorrent library.
Transmission - Transmission has the features you expect in a BitTorrent client: encryption, a web-based interface...