Slackbox - Spotify playlist collaboration through Slack
Party On Demand - Have a party delivered to your door in 60 mins or less.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
PartyWith - Connecting people who love to party - anytime, anywhere.
PlaylistMap - Connect with Spotify playlist curators from around the world
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.