Spotify - Map shows when two people play same song at same time
Parallel - Listen to music with friends over Spotify at the same time
Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
Slackbox - Spotify playlist collaboration through Slack
SpotiMy - Play/Pause and Next/Previous functions for Spotify directly on your Menu Bar!
Join My Playlist - Listen to music live together with your friends in Spotify.