Replayify - Create playlists from your most played Spotify tracks
Skip Tunes - Control iTunes, Spotify, or Rdio from your Mac's menubar
Spotify - Map shows when two people play same song at same time
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
CoverSutra - CoverSutra gives you a handy and attractive way to control iTunes without ever leaving your current...
PlayTray - Control the Spotify web player with your macOS media keys