YT Music - An unofficial Mac app for YouTube Music
Yout - YouTube to Mp3 Converter
Deezer iMessage app - Share your music on iMessage with Deezer!
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
SoundCloud Desktop - Use your media-keys ⏮⏯⏭ with SoundCloud
You-Get - Command-line utility to download media contents from the web