These are some of the public projects that use libtorrent. If you want your project listed here, let me know.
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.
qBittorrent is a free and open-source cross-platform bittorrent client written in Qt, that is available for Linux, macOS and Windows and is released under GPLv2 license.
It comes with a powerful and easy-to-use graphical interface, as well as an embedded Web interface. It has a range of features such as an RSS downloader, scheduling rate limits, torrent queueing, automatic resuming, background downloading, and system tray icon with a password-protected lock.
Originally written by Christophe Dumez, currently maintained by sledgehammer999.
DownZemAll! is a mass download manager for Windows, Mac OS X and Linux. It helps you to select, organize, prioritize and run your downloads in parallel. Based on the Qt5 framework, DownZemAll! is written in C/C++. It's a free (as in "free speech" and also as in "free beer") software. Its use is governed by LGPL License.
Tonidoplug is a tiny, low-power, low-cost home server and NAS device powered by Tonido software that allows you to access your applications, files, music and media from anywhere.
Folx is a torrent client and download manager for macOS. The Free version of Folx has all the basic functionality of the torrent client, which allows users to download and create torrent files. Folx PRO (available for a small fee) features the possibility to search for torrent files just from Folx interface. So there is no need to browse through multiple torrent trackers searching for particular file.
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.
MooPolice is a windows bittorrent client with a unique look.
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.
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.
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 (accessible through a web browser). Written by Michael Wojciechowski and Johan Strom.
electric sheep is a screensaver which collectively generates animations and lets the users vote which one to live on.
Tvitty is a bittorrent client for Vista Media Center, which allows searching and downloading of torrents directly on your TV.
hrktorrent hrktorrent is a light console torrent client written in C++.
Halite is a windows bittorrent client controllable via an XML-RPC interface.
Arctic Torrent is a light-weight bittorrent client for windows. Written by Cory Nelson.
Bubba is a mini-sized server, designed to fit your home better than an always running PC. Boasting Torrent downloader, DAAP streaming, Web, E-mail, printer and FTP server etc.
Flush is a GTK-based BitTorrent client.
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.
BitSlug is a macOS cocoa client.
DelCo is a research project at Tampere university of technology, Finland.
Torrent2Exe is a small BitTorrent client. Its basic idea is to let users download a custom-built EXE program with the torrent file integrated into it.
ZyXEL NSA220 makes it easy to store, protect and share files between users on your home network. The built-in DLNA server works with many set top boxes to allow you to play back music, watch video files, or view photos on your home theater system, while the built in download manager can automatically download video and audio podcasts as well as allow you to download bittorrent files without needing to leave your computer on.