Playlistful - Collaborative playlists for parties!
Party Bot - A bot that helps find the best parties happening near you.
Flock Trips - Bachelor parties planned, organized, and squared away
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Soulpicks - Discover places loved by friends and experts