If you want to roll your own server I believe there is a plugin for Home Assistant that can take voice input. https://home-assistant.io/ https://home-assistant.

If you want to roll your own server I believe there is a plugin for Home Assistant that can take voice input. https://home-assistant.io/ https://home-assistant.io/ But I don't think either the Echo or the Google Home will connect to that. If you are running home assistant on a raspberry Pi, you could probably build that right into your own speaker.