been posting in the Show your Projects sub for a while, but this might be the best place for it:
I've written a native Alexa smart home integration for Domoticz - given there's no external facing centralised Domoticz service (is there?), it requires you to roll your own - but my ReadMe seems to be enough for a few people
controls device discovery by Room Plan, Group control, light controls (on/off/dim) & temperature setting,
https://github.com/madgeni/alexa_domo