Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Ampache - Web ( HTTP centralized ) based audio/video streaming application
ioBroker - flexible and modular application for the IoT and Smarthome
YouTube Music - YouTube Music is a streaming app primarily designed for Android and iOS mobile devices. The app lets individuals search for music from their favorite artists, enjoy playlists, and access 30 million musical tracks.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Navidrome - Music Server and Streamer compatible with Subsonic/Airsonic.