qBittorrent Portable
lightweight torrent client
qBittorrent is a fast, lightweight bittorrent client with a familiar interface.
Features
-Integrated search engine (adding new sites is not currently supported)
-All Bittorrent extensions: DHT, Peer Exchange, Full encryption, Magnet/BitComet URIs, etc
-Remote control through a Web user interface
-Advanced control over trackers, peers and torrents (queueing and prioritizing)
-UPnP / NAT-PMP port forwarding support
-Available in ~25 languages (Unicode support)
-Torrent creation tool
-Advanced RSS support with download filters (inc. regex)
-Bandwidth scheduler
-IP Filtering (eMule and PeerGuardian compatible)
-IPv6 compliant
https://portableapps.com