qBittorrent is the closest open source equivalent to µTorrent. qBittorrent is based on Qt4 toolkit and libtorrent-rasterbar. It offers an Ajax-webinterface, integrated search, supports DHT, Peer Exchange, Magnet-Links, IPv6, Proxies, RSS, Protocol Encryption and is available in 25 Languages.
Features
Simultaneous download of multiple torrents
Integrated torrent search engine
Integrated RSS feed reader and downloader
Good internationalization
DHT, PeX, Encryption, LSD, UPnP, NAT-PMP
Cross platform (Linux, Mac Os, Windows)
Very lightweight
Torrent queueing and prioritizing
Control over files in a torrent (filtering, prioritizing)
Nice µTorrent-like interface with Qt4 toolkit (qBittorrent v2.x)
IP filtering (eMule dat files or PeerGuardian files)
Peer display with country and hostname resolution (qBittorrent v2.x)
Advanced control over torrent trackers (qBittorrent v2.x)
µTorrent peer id spoofing to avoid tracker blacklisting
Closest open source equivalent to µTorrent (qBittorrent v2.x)
Torrent creation tool
Remote control through Secure Web User Interface
