Spotify - Map shows when two people play same song at same time
SpotiMy - Play/Pause and Next/Previous functions for Spotify directly on your Menu Bar!
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Exportify - Export your playlists from Spotify
Tiny Mix - NPR Tiny Desk — mixed up, one song at a time.
Skip Tunes - Control iTunes, Spotify, or Rdio from your Mac's menubar