Spotalike - Spotify playlist with similar songs, according to Last.fm
Baritone - Spotify controls that live in your menubar.
MusaicFM - An iTunes like screen saver based on Spotify and Last.fm
Soundiiz - Transferring playlists between various music streaming platforms.
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
Hologram - Frontend Development and Design