"BitTorrent is popular peer-to-peer sharing communication
protocol used for transferring all kind of files over the Internet.
Two of the most popular BitTorrent clients for Linux are Azureus
and KTorrent. If you're looking for a robust, fast, simple, and
powerful BitTorrent client, you will probably go with KTorrent. If
you want a Java-based client that runs on every platform and allows
you to configure every detail for BitTorrent transfer, consider
"Both Azureus and KTorrent are feature-rich and powerful
BitTorrent clients with powerful file transfer management GUIs,
statistics, and highly configurable settings menus..."