Torrent File Editor - Qt based GUI tool designed to create and edit .torrent files.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
bittorrent tracker editor - will add/remove bittorrent tracker from the torrent file(s).
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.