The qBittorrent project aims to provide a Free Software alternative to µTorrent. Additionally, qBittorrent runs and provides the same features on all major platforms (Linux, Mac OS X, Windows, OS/2, FreeBSD).
qBittorrent is based on the Qt toolkit and libtorrent-rasterbar library.
Polished µTorrent-like User Interface
Well-integrated and extensible Search Engine
Simultaneous search in most famous BitTorrent search sites
Per-category-specific search requests (e.g. Books, Music, Movies)
All Bittorrent extensions
DHT, Peer Exchange, Full encryption, Magnet/BitComet URIs, ...
Remote control through a Web user interface
Nearly identical to the regular UI, all in Ajax
Advanced control over trackers, peers and torrents
Torrents queueing and prioritizing
Torrent content selection and prioritizing
Natively integrated: When Downloads Completes Options (no need for additional script or plug-in)
Exit, Suspend, Hibernate, Shutdown
UPnP / NAT-PMP port forwarding support
Available in ~41 languages (Unicode support)
Torrent creation tool
Advanced RSS support with download filters (inc. regex)
IP Filtering (eMule and PeerGuardian compatible)
Sequential downloading (aka "Download in order")
Available on most platforms: Linux, Mac OS X, Windows, OS/2, FreeBSD
Links to official sites
Sequential downloading RSS Downloader HTTP Web seeding Download torrents Download Scheduling Download Queue Disable Subfolder User interface Easy to use Open Source apps Extensible by Plugins/Extensions Built-in RSS reader Ad-free Multiple languages Integrated Search Drag n drop Peer-To-Peer Speed charts Torrent search Portable Lightweight