Flock Trips - Bachelor parties planned, organized, and squared away
Magic Playlist - Get the playlist of your dreams based on a song
Clearbit for Slack - Send all signups directly to a Slack channel
Spotalike - Spotify playlist with similar songs, according to Last.fm
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