Add-on:transmission

Usage
To enable Transmission, select "Start Transmission at boot" and make sure "Allowed IP Addresses" has a * character in it. Click OK and reboot your OpenELEC machine.

For better user experience Transmission can be managed through XBMC addon System -> Add-ons -> Get add-ons -> XBMC.org Add-ons -> Program Add-ons -> Transmission

Transmission on a remote web browser http://[openelecIP]:9091

Transmission on XBMC Programs -> Transmission

You can use the open button to queue a new item, and use the window below to monitor the progress of existing downloads.

Editing Transmission settings http://openelec.tv/forum/78-transmission-bt-client/10992-transmission-settings-not-saved#12772