You can also create your own torrent files using the application. There is also support for magnet URLs, port forwarding and a random selection, protocol encryption, multi-tracker announcing like with µTorrent, tracker logins, and more. It includes features such as file selection and file priority specification, disk caching, super-seeding, a managed torrent queue system, torrent tracker editing specified in the torrent, and more. The application is based on the excellent libtorrent library from Rasterbar Software.
Halite is another open-source BitTorrent client.