KTorrent

KTorrent is a BitTorrent application by KDE which allows you to download files using the BitTorrent protocol. It enables you to run multiple torrents at the same time and comes with extended features to make it a full-featured client for BitTorrent.

Features:

Queuing of torrents
Global and per torrent speed limits
Previewing of certain file types, build in (video and audio)
Importing of partially or fully downloaded files
File prioritization for multi-file torrents
Selective downloading for multi-file torrents
Kick/ban peers with an additional IP Filter dialog for list/edit purposes
UDP tracker support
Support for private trackers and torrents
Support for µTorrent's peer exchange
Support for protocol encryption (compatible with Azureus)
Support for creating trackerless torrents
Support for distributed hash tables (DHT, the Mainline version)
Support for UPnP to automatically forward ports on a LAN with dynamic assigned hosts
Support for webseeds
System tray integration
Tracker authentication support
Connection through a proxy