Free Download Manager is okay for me for the occasional torrent i grab, otherwise its great for just downloading in general. (window only i think)

however most of my activity is in usenet/nzb and ive settled on nzbget for this work. I ran sabnzbd for a long time (and concurrently), but it seems that nzbget works for everything no probs.

Ive been out of the torrent game for a long while, and dont know the current status of projects like qtorrent.