Musish - A web client for Apple Music
Magic Playlist - Get the playlist of your dreams based on a song
feverTunes - A web player for Apple Music support adding tags to playlist
Spotalike - Spotify playlist with similar songs, according to Last.fm
Apple Music - Apple Music app combines your personal iTunes library with Apple's music subscription service. Music you have purchased from the iTunes store, or synced over from other sources, is available in the "Library" tab. Read more about Apple Music.
Playlist Machinery - Tools that help you create & organize your Spotify playlists