Playlist Machinery - Tools that help you create & organize your Spotify playlists

Jukebox - Collaborative music player

TrackStack - Easy Spotify playlist sharing and collaboration

OutLoud Social Jukebox - Control the music with your friends in real-time

BeatMix - Enables Shuffle and Radio for multiple artists in Spotify

Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...