Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
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!
Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
Owlead - Grow your Twitter with valuable followers, effortless
Exportify - Export your playlists from Spotify