@Faecon
I am the author of the SpotifyPlus integration, which is a direct replacement for the native HA Spotify integration. I also wrote the underlying SpotifyWebApiPython Python 3 Library that interfaces with the Spotify Web API. It does not use librespot, snapcast, or the SpotifyConnect addon.
SpotifyPlus supports Sonos devices, as well as most devices that implement the Spotify Connect protocol (Bose, Yamaha, TCL, etc). I personally use it with my Sonos Symfonisk speaker as well as Bose SoundTouch devices. It does not support Chromecast devices at this time.
More Information Links
- SpotifyPlus GitHub Project Wiki Home
- SpotifyPlus GitHub Project Wiki Services Provided
- SpotifyPlus HACS Custom Repository
- Install Instructions (via HACS)
Hope it helps!