KTorrent

A highly-configurable feature-rich front-end for torrent downloads

Features

• Upload and download speed management, including scheduling
• Supports UDP Trackers
• Can detect and import partially or fully downloaded files
• Can use IPV6
• Has a lot of plugins which extends its funtionality.

and many more. A longer list of features is available from Wikipedia.

Plug-ins

Search

You can search for torrents directly from KTorrent, instead of using a web browser. It has some engines already configured, and you can add more through Settings -> Configure KTorrent -> Search.

See Also

A full description can be found on the project pages and the many screenshots demonstrate its flexibility. There is also a user forum.