Transmission has been built from the ground up to be a lightweight yet powerful BitTorrent client. Its simple, intuitive interface is designed to integrate tightly with whatever computing environment you choose to use. Transmission strikes a balance between providing useful functionality without feature bloat. Furthermore, it is free for anyone to use or modify. Transmission is open source (MIT license).
These days, bandwidth is a precious commodity. Transmission allows you to ration this commodity efficiently. You might want to queue your torrents for maximum performance. Or throttle their speed during peak periods. Transmission easily lets you do both, and thus only works its hardest when you want it to.
Support for Growl notifications and dock badging keep you updated with what’s going on so you can get back to doing more important things.
If you are interested in helping out the Transmission project in any way, we encourage you to head over to our development page. The current developers welcome anybody who is interested in implementing new features, documentation, or translations.

What’s new:

Version 1.21:

• Fix rare crash-on-startup bug
• Handle corrupt announce URLs in torrent files more gracefully
• Fix minor memory leak when closing torrents
• Fix visual glitch with the pieces bar
• Italian localization included

Website
Download Transmission