dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
rTorrent - rtorrent is a BitTorrent client for ncurses, using the libtorrent library.
Torrent File Editor - Qt based GUI tool designed to create and edit .torrent files.
BiglyBT - BiglyBT is a feature filled, open source, bittorrent client. Auto migrate from Vuze and Azureus. I2P integration, Swarm Merging, Advanced Tag System, WebTorrent support, built-in VPN kill switch, Meta-search, UPnP/DLNA access, and much more.
JSTorrent - Torrent client for Google Chrome and Chromebooks
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.