Transmission has the features you want from a BitTorrent client: encryption, a web interface, peer exchange, magnet links, DHT, µTP, UPnP and NAT-PMP port forwarding, webseed support, watch directories, tracker editing, global and per-torrent speed limits, and more.

Unlike some BitTorrent clients, Transmission doesn't play games with its users to make money:

• Transmission doesn't bundle toolbars, pop-up ads, flash ads, twitter tools, or anything else.
• It doesn't hold some features back for a payware version.
• Its source code is available for anyone to review.
• We don't track our users, and our website and forums have no third-party ads or analytics.