Playlist Machinery - Tools that help you create & organize your Spotify playlists
Slackbox - Spotify playlist collaboration through Slack
Tablecruncher - This lightweight, yet powerful CSV editor for Apple Mac helps you crunch all your tabular data.
Tad - Create sleeve and cover art for your band in minutes
Exportify - Export your playlists from Spotify
The Life of Pablol - Kanye album art generator