Playlist Machinery - Tools that help you create & organize your Spotify playlists
aux.app - A free web-based music platform to play music from other popular online streaming services.
TrackStack - Easy Spotify playlist sharing and collaboration
Jukebox - Collaborative music player
BeatMix - Enables Shuffle and Radio for multiple artists in Spotify
CueBot - A better way to request for songs at a party 🎉