electric sheep

electric sheep is a screensaver which collectively generates animations and lets the users vote which one to live on.

qBittorrent

qBittorrent is a QT bittorrent client available for linux (likely portable to most other desktops as well). Written by Christophe Dumez.

btg

btg is a unix bittorrent client which is run as a daemon. It has multiple user interfaces which connects to the daemon. One GUI (Gtkmm), one terminal interface (ncurses) and one web interface (accessable through a web browser). Written by Michael Wojciechowski and Johan Ström.

deluge torrent

deluge Torrent is a more full-featured yet still lightweight bittorrent client. It has the ability to automatically resume partial downloads and background to the system tray.

halite BitTorrent

Halite is a windows bittorrent client controllabel via an xml-rpc interface.

Free download manager

FDM is a powerful, easy-to-use and absolutely free download accelerator and manager. Moreover, FDM is 100% safe, open-source software distributed under GPL License.

Lince

Lince is a bittorrent client using libtorrent to handle bittorrent protocol and gtkmm for the interface, it has been designed to be a light and full featured client.

Miro

Miro is a free application for channels of internet video (also known as video podcasts and video rss). Miro is designed to be easy to use and to give you an elegant fullscreen viewing experience.

FatRat

FatRat is an open source download manager for Linux/Unix systems written in C++ with the help of the Trolltech Qt 4 library. It's simple to use and install.

LeechCraft

LeechCraft LeechCraft is a free open source cross-platform extensible software, which primary goal is support of file sharing networks and protocols like HTTP and FTP

BitRocket

BitRocket is a MacOS X bittorrent client.

MooPolice

MooPolice is a windows bittorrent client with a quite unique look.

Linkage

Linkage is a gtkmm client that aims to be middle weight.

BitsCast

RSS reader, podcast subscriber, video feed downloader, bittorrent feed downloader. See BitsCast homepage for more info.

hrktorrent

hrktorrent hrktorrent is a light console torrent client written in C++.

Bitfox

A firefox plugin integrating bittorrent downloads in firefox.

BitSlug

BitSlug is a MacOSX cocoa client.

BitBuddy

BitBuddy is a windows bittorrent client by Daniel Wang, quite similar to BitComet GUI-wise.

Arctic Torrent

Arctic Torrent is a light-weight bittorrent client for windows. Written by Cory Nelson.

DelCo

DelCo is a research project at tempere university of technology, finland.

ZipTorrent

ZipTorrent is another windows bittorrent client with decentralized search facility.

Acquasition

Acquasition is a multi-network peer-to-peer client for Mac.

FireANT

FireANT is a video blog available for Windows and Mac OSX.

eDonkey 2000

eDonkey2000 comes bundled with a bittorrent plugin by 'The Orphan'.

pHoeniX

pHoeniX is an eMule mod supporting, among other things, bittorrent.