Build your multi-room and multi-provider sound server with Platypush, Mopidy and Snapcast
20 best alternatives to Mopidy as of 2023 - Slant
I tried to make a Sonos replacement using OpenHAB, Snapcast, Mopidy, Raspberry Pi Zero's and speakers from Amazon! (Total cost for each unit/room ~= £52GBP) and I'm really pleased with the result! :
Build a multi-room audio system with Raspberry Pi — The MagPi magazine
Multi-room audio with Snapcast, Mopidy, and Home Assistant - Blog - Home Assistant Community
Multi-room audio with Snapcast, Mopidy, and Home Assistant - Home Assistant
Build a multi-room audio system with Raspberry Pi — The MagPi magazine