However, some torrent distrobuters don't like this very much, because of a way that it deals with the torrents files. I won't be boring and go into details 😛 .
Another good one is Azureus, a Java based Bittorent manager, found here: http://azureus.sourceforge.net/
(I believe this one requires a Java platform to be installed on the computer, which you can find at http://java.sun.com/)