Windows Torrent

BitTorrent and uTorrent
"Literally they are the same. Owned by the same company and the code is basically copy and paste. I recommend transmission or deluge. utorrent/bittorrent is so overrated and its getting shittier, fast." 

Transmission
Transmission BitTorrent Client - http://www.transmissionbt.com/

Deludge
Deluge BitTorrent Client - http://deluge-torrent.org/

GNU GPL3 License