Spotalike - Spotify playlist with similar songs, according to Last.fm
Sleeve - Your currently playing track displayed right on your desktop
MusaicFM - An iTunes like screen saver based on Spotify and Last.fm
Uber Ride Request Widget - Embed the Uber experience in your app in a few lines code
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
Easle - Discover and hire hand-picked independent artists