To understand the criteria on which the following recommandations are made please read the introduction article.

Deluge is a good choice if you are using a Linux based OS. It’s based on libtorrent which “was created with the intention of being lightweight and unobtrusive. It features multiple user-interfaces including: GTK+, web and console. It has been designed using the client server model with a daemon process that handles all the bittorrent activity. The Deluge daemon is able to run on headless machines with the user-interfaces being able to connect remotely from any platform. Deluge features a rich plugin collection; in fact, most of Deluge’s functionality is available in the form of plugins “. It has all the nine features mentioned in the previous article except for Super seeding.

Transmission is the default BitTorrent that comes with Ubuntu. That says a lot. “It is designed from the ground up to balance power with simplicity. We’ve set initial preferences so things Just Work, while advanced features like watch directories, bad peer blocking, and the web interface can be configured with just a few clicks. With few dependencies and written in C, Transmission has the lowest memory footprint of any BitTorrent client we’ve seen. It’s also the client of choice on low-memory hardware. Imageshack chose Transmission for its BitTorrent farms because the competition requires amounts of memory several times greater than Transmission. You also get some useful add-ons.

The qBittorrent project was created in March 2006 with the idea of developing a new Bittorrent client for Linux (and possibly other systems) that would be easy to use, good looking, feature-full but lightweight. You can check it’s features on it’s web page. qBittorrent is fast, stable and provides unicode support as well as many features including a competent integrated search engine. It’s a really promising client that is updated constantly.

KTorrent is another emerging BitTorrent client that looks and behaves very well. Check the description on wikipedia here.  KTorrent is a BitTorrent client written in C++ for KDE using the Qt user interface toolkit. It is maintained in the KDE Extragear. Use it with confidence.

Vuze runs on all major platforms, so we have aa Linux version as well. It’s exactly the same Java based app that lets you chat with your friends and share videos, but which is hungry for CPU and RAM. The great plugins gallery may convince you it’s worth it. If you have a good computer give it a try.

And finally a client appealing for experienced uses, console lovers:

rTorrent is a text-based ncurses BitTorrent client written in C++, based on the libTorrent libraries for Unix (not to be confused with libtorrent by Arvid Norberg), “with a focus on high performance and good code. On high-bandwidth connections it is able to seed at 3 times the speed of the official client.” It is highly appreciated by lots of people. If you are a computer geek this must be for you. You also have some 3rd party utilities (GUI, RSS, IRC).

Conclusion:

So these are the best and the most popular BitTorrent clients I advice you to use on Linux. Of course it depends on what distibution you have. In general you can find packages for all most every popular Linux distribution for the programs listed above. There are others BitTorrent clients but I say stick to one of the popular clients because they are tested, accepted on all trackers and periodically updated and improved.

Read more:
Best BitTorrent Clients for Mobile Devices
Best Windows BitTorrent Client
Best Mac OS X BitTorrent Client