SubmitHub - SubmitHub makes it easy to contact music bloggers, Spotify playlisters, record labels and more. We give you all sorts of statistics and ways to filter who to send your music to.
Doppler for iPhone - A better offline music experience for iPhone
Spotalike - Spotify playlist with similar songs, according to Last.fm
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
SpotMenu - Spotify and iTunes in your macOS menu bar
Magic Playlist - Get the playlist of your dreams based on a song