µTorrent or utorrent is a client program for BitTorrent protocol for sharing files which are normally called as torrents. It supports major platforms and has …

Resilient, fast and scalable file sync software for enterprises and individuals.

uGet is a GTK based Download Manager for GNU Linux and Windows.

Vuze (formerly Azureus) is a free BitTorrent client.

aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink, etc.