qBittorrent is a cross-platform Bittorrent client, written in C++ and available on Linux, Windows, and Mac OS X. It is free and open-source software developed by a Swedish programmer named Ludvig Strigeus, based on the Qt toolkit.
uTorrent is a freeware BitTorrent client for Windows, developed by BitTorrent, Inc. It was designed to use less computer resources while downloading files and to be more efficient than other BitTorrent clients of its time. uTorrent is also available for Linux and Mac.
Vuze is a BitTorrent client and media player developed by Azureus Software. Vuze is currently in version 4.8.1. Vuze is available on Windows, Mac, and Linux.
Transmission is a free and open-source BitTorrent client for Linux and other Unix-like operating systems. It is written in C++ and uses ncurses.
Deluge is a cross-platform BitTorrent client written in Python and uses the GTK+ toolkit.
FrostWire is a free, open-source, cross-platform BitTorrent client. FrostWire is a lightweight, popular, and efficient BitTorrent client. FrostWire is a straightforward application with a simple interface. FrostWire includes a built-in search engine that makes finding a specific file a snap. FrostWire includes a built-in web server that simplifies the process of downloading a torrent. FrostWire is a fast, efficient, and easy-to-use BitTorrent client.