Torrent File Editor - Qt based GUI tool designed to create and edit .torrent files.
LIII BitTorrent Client - multi-platform bittorrent client
dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
libtorrent - libtorrent is a feature complete C++ bittorrent implementation focusing on efficiency and...
bittorrent tracker editor - will add/remove bittorrent tracker from the torrent file(s).
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.