qBittorrent – uTorrent Alternative BitTorrent Client
The qBittorrent is a open source BitTorrent file sharing client for Windows, Mac and Linux that aims to provide a free software alternative to µTorrent. qBittorrent features such as an integrated search engine, UPnP, encryption, PeX, a torrent creation tool. qBittorrent integrated search engine allows user to search for torrent from the main torrent Web sites simultaneously in a transparent fashion. qBittorrent support for l'UPnP/NAT-PMP, Bittorrent protocol encryption (Azureus-compatible), Peer Exchange (PeX) compatible with µTorrent, IP filtering (eMule-like "ipfilter.dat" or PeerGuardian filters), Torrents (and the files they contain) prioritizing, remote control through a secure Web User Interface.
qBittorrent Portable is the qBittorrent Bittorrent client packaged with a PortableApps.com launcher as a portable app, so you can share files, etc. on your iPod, USB flash drive, portable hard drive, etc. It has all the same features as qBittorrent, plus, it leaves no personal information behind on the machine you run it on, so you can take it with you wherever you go.