BitTornado is an improved bittorrent client that was built on the original BitTorrent. This client features an enhanced console/curses mode, lots of new features under the hood, and is generally one of the most advanced clients out there. It allows you to limit your bandwidth consumption, and provides more control over your torrents. It does everything the original bittorrent does, plus more.
Note : The T-0.3.9a release contains a bugfix for the tracker, and the modified installer includes a DLL which is missing on some people's systems. If you're already successfully running T-0.3.9 on your system, there's no need to upgrade.
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News source: klitetools.com