Snapcast works like Sonos. Open source and runs on a raspberry pi (but probably best to run the server on something beefier). I put a Chromecast Audio on extern

Snapcast works like Sonos. Open source and runs on a raspberry pi (but probably best to run the server on something beefier). I put a Chromecast Audio on external USB line-in for compatibility with Spotify etc, and mopidy for local audio. https://github.com/badaix/snapcast https://github.com/badaix/snapcast