Magic Playlist - Get the playlist of your dreams based on a song
Musish - A web client for Apple Music
Spotalike - Spotify playlist with similar songs, according to Last.fm
feverTunes - A web player for Apple Music support adding tags to playlist
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Concertino - A classical music client for Apple Music 🎻🎶