I was trying to create a GSD to connect my Alarm/automation panel to Pluto, but could not find documentation on GSD on your site.
My alarm panel (Elk M1) supports Insteon (plus several other interfaces), so adding support to it means opening Pluto to a pletora of established automation hardware system (relays, lightning, digital I/O, analog sensors, alarm sensors, thermostats, etc.). And the price of this panel is very good (much cheaper than HAI or JDS and also includes the alarm portion - which the other automation panel dont).