As far as I can tell, HomeKit is designed to use any app that an HK-compatible HW vendor might supply. And since homebridge doesn't use any specific hardware, any HK app could be used.
I don't have any HK-compatible hardware - I'm only using Indigo (and homebridge).
I downloaded a couple of free apps from HW vendors - The Insteon+ app and the Eve app from Elgato. They both seem to do an OK job populating the homebridge device list.
What apps are best for this purpose? Which make it easiest to assign (Indigo) devices to rooms/zones/scenes, etc?
Thanks!
joe