SOUNDS - Discover music with friends
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
Spotify - Map shows when two people play same song at same time
Sonos One - A self-contained, Alexa-connected speaker from Sonos
Songlink - Share music with anyone.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.