Pandora Driver Music - Free, ad-free music from Pandora for Uber drivers
Magic Playlist - Get the playlist of your dreams based on a song
SpotMenu - Spotify and iTunes in your macOS menu bar
Spotalike - Spotify playlist with similar songs, according to Last.fm
volt.fm - See your Spotify stats, connect with 125k+ music fans, and discover new music.⠀volt.fm helps you experience Spotify in a totally new way.
Playlist Machinery - Tools that help you create & organize your Spotify playlists