BitComet!

The qBittorrent project aims to provide a Free Software alternative to µtorrent. Additionally, qBittorrent runs and provides the same features on all major platforms (Linux, Mac OS X, Windows, OS/2, FreeBSD).

µTorrent is a lightweight BitTorrent client that includes standard features such as bandwidth prioritization, scheduling, RSS auto-downloading and Mainline DHT. Additionally, µTorrent supports the Protocol Encryption joint specification and peer exchange.

Deluge is a full-featured BitTorrent client for Linux, Unix and Windows. It is written in python, uses libtorrent (rasterbar) at its core and GTK for the main user interface along with web and console interfaces for advanced client/server facility.

FDM accelerates downloads by splitting files into sections and then downloading them simultaneously.In addition, Free Download Manager allows you to adjust traffic usage, organize downloads, control file priorities for torrents, efficiently download large files and resume broken downloads.FDM can boost all your downloads up to 10 times, process media files of various popular formats, drag&drop URLs right from a web browser as well as simultaneously download multiple files!

Tribler is an application that enables its users to find, enjoy and share content. With content we mean video, audio, pictures, and much more. Tribler has three goals in helping you, the user: find, consume and share content.

Using WebRTC, FilePizza eliminates the initial upload step required by other web-based file sharing services. When senders initialize a transfer, they receive a "tempalink" they can distribute to recipients. Upon visiting this link, recipients' browsers connect directly to the sender’s browser and may begin downloading the selected file. Because data is never stored in an intermediary server, the transfer is fast, private, and secure.

PicoTorrent is a tiny BitTorrent client for Windows with low memory usage, high performance and a native user interface. No ads, carefully selected features, and a native user interface integrating seamlessly with your desktop.

KTorrent is a bittorrent application for KDE which allows you to download files using the BitTorrent protocol. It enables you to run multiple torrents at the same time and comes with extended features to make it a full-featured client for BitTorrent. KTorrent offers advanced configuration options, plenty of features and a wealth of useful plugins, like the Search plugin which will allow you to search for torrents directly from within KTorrent.

BiglyBT is a feature filled, open source, bittorrent client based on the Azureus open source project, now Vuze .

FlashGet is a leading download manager and has the highest amount of users on the internet. It uses MHT(Multi-server Hyper-threading Transportation) technique, supports various protocols and has excellent document management features.

CuteTorrent is a lightweight BitTorrent client with a simple, intuitive interface designed to quickly download and share torrent files. At the heart of it’s core resides the powerful libtorrent BitTorrent library.