How do I get magnet links to work with Deluge?
On OS X, Deluge is unable to associate itself with magnet links due to GTK-OSX not supporting the feature (See ticket #2420).

A workaround is to use Deluge Magnet Handler. To use it, download the ZIP, extract it, move Magnet Handler.app to the Applications folder and run it once.

The application works by associating itself with magnet links and adding them to Deluge using a AppleScript when magnet links are pressed.