Historians may argue whether it was Louis XV or his mistress, Madame de Pompadour, who famously said, "Après moi, le Déluge" ("After me, the deluge"), but what cannot be argued is that, today, Deluge is the name of an efficient BitTorrent client that you would do well to try.
Unlike other BitTorrent clients that consume high levels of RAM and CPU usage, Deluge is lightweight and unobtrusive. To help cut down the bloat, most of its functionality is available as plugins, so you can streamline its runtime requirements. Deluge is free software licensed under the GNU General Public License (GPL). Windows, Macintosh, and Linux versions are available, and you can run Deluge in KDE, Xfce, GNOME, and a number of other desktop environments.