 Since version 6.0, the BitTorrent client has been a rebranded version of μTorrent.As a result, it is no longer open source and is currently available for Microsoft Windows and Mac OS X.

μTorrent (or uTorrent; commonly abbreviated as "μT" or "uT") is a freeware, closed source BitTorrent client owned by BitTorrent, Inc.It is the most widely used BitTorrent client outside China.