dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
Koinonein BitTorrent Client - A fast and modern BitTorrent Client.
Android Torrent Client - Android Torrent Client. Open Source. GPLv3
PicoTorrent - PicoTorrent is designed to be a tiny, easy-to-use BitTorrent client with low memory usage.
Bitford - BitTorrent client for Chrome that can stream videos while they're being downloaded
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.