BitTorrent is a free and powerful peer-to-peer program that will let you upload and download files via the BitTorrent protocol. BitTorrent was the first client written for the protocol. The current client includes a range of features, including multiple parallel downloads. BitTorrent has several statistical, tabular and graphical views that allow a user to see what events are happening in the background. BitTorrent works flawlessly, it won’t cause any ram or cpu problems, temperature won’t go up, no matter how many torrents you download. This is perhaps the best BitTorrent client available so far, in my opinion. Since it is free, you have nothing to lose to try it!

BitComet is able to get first those parts of a file that would let you play a little make sure you are downloading what you want. You can also BitComet to share files with your friends by connecting to a P2P network supported by the program.

uTorrent (µTorrent) is a popular torrent client, featuring bandwidth prioritization, scheduling, RSS auto-downloading and Mainline DHT (compatible with BitComet). Additionally, uTorrent supports the Protocol Encryption joint specification (compatible with Azureus 2.4.0.0 and above, BitComet 0.63 and above) and peer exchange. uTorrent is light, opens in a second, it is easily configured and does its job. However, in some versions, increases the heat in the computer – demanding more cpu power without any obvious reason.

BitSpirit is a free BitTorrent client, with clean user interface and support for multiple simultaneous downloads.

Vuze (former Azureus) is written in Java, which makes it platform independent but unable to take full advantage of the Windows engine. The active windows are shown in the sidebar. The active torrents are displayed through My Library (and its subsets Downloading and Unwatched). Vuze HD Network offers a browsable limited directory of available torrents, and you can also search the open internet for new torrents. There are also separate pages for e.g. Subscriptions, Devices and for each active plugin. Vuze is able to import unfinished downloads left over by previously used clients (something utorrent can not do), but it seems sometimes unable to handle its resources, thus not downloading some torrents. All differences considered, uTorrent is a better client than Vuze, and you should prefer if, if it doesn’t cause heat problems.

Deluge BitTorrent client features multiple user-interfaces including: GTK+, web and console, as well as a rich plugin collection; in fact, most of Deluge’s functionality is available in the form of plugins. If you are going to try Deluge after some other BitTorrent client, just configure it to use for its downloads the folder you already use, and it will re-load whatever you have downloaded and continue to finish. Yet, you need to add the torrents yourself from .torrent files or urls. Check this post if you try to resume your torrent permanently after a Deluge error.

qBittorrent supports DHT, Peer Exchange, Full encryption, Magnet/BitComet URIs, …, Remote control through a Web user interface, etc. Don’t forget to enable the Speed in Titlebar option (from the “View” menu), if you want to see the upload and download speeds on the titlebar of the program – and on the Windows Taskbar. Sometimes a torrent may turn by itself to pause status!, and there is not even an auto-resume feature. Check this post on what you can do to finish your download.