A tool that synchronizes your YouTube playlists and other music providers with your Cloud Storage like Nextcloud as MP3s.

• MusicService @ GitHub.

Mopidy is an extensible music server written in Python.
It plays music from local disk, Spotify, SoundCloud, TuneIn, …
Users can edit the playlist from any phone, tablet, or computer
using a variety of MPD and web clients.

• Mopidy @ GitHub.
• Mopidy-MPD
  (Mopidy-MPD @ GitHub)
  is a Mopidy extension for controlling playback from MPD clients
  It's a frontend that provides a full MPD server implementation to make Mopidy
  available from MPD clients.

A scriptable stream downloader for Qobuz, Tidal, Deezer and SoundCloud.

MediaGoblin is a free software media publishing platform that anyone can run. You can think of it as a decentralized alternative to Flickr, YouTube, SoundCloud,