Peerflix - Streaming torrent client for Node.js
Torrent File Editor - Qt based GUI tool designed to create and edit .torrent files.
JSTorrent - Torrent client for Google Chrome and Chromebooks
dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
Exatorrent - Exatorrent is a platform where you can download torrent files for free easily.
bittorrent tracker editor - will add/remove bittorrent tracker from the torrent file(s).