I'm still an Insteon user (about half my lights). HE communicates between the Insteon hub and Hubitat with a great little Node.js app that Scott Keuster from the SmartThings community has been improving of the last few years. It allows local control of Insteon dimmers and switches. Contacts, leak sensors and motion sensors inputs are in the works too.
@jeubanks has his running via ISY and a node.js server. It's a simple thing to build. You can run it on a Raspberry Pi no problem. Very light weight app built on the HASS Home Controller work.
If you're still using Insteon, and if you're interested, I was just posting about this last night.
