>qStalledTorrent
Used it once and hated it, if it couldn't find any peers within five seconds it stalled everything out and you had to restart each torrent.
I used Tixati for a while and liked it, but it was proprietary and not ideal for my setup. I've now transitioned to a fully Linux-based environment and have Transmission 3 running from my home server with a web interface I use for managing torrents. Zero complaints, except the interface is very very slow to update and freezes the whole page when fetching current downloads/uploads.