VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Spotify - Map shows when two people play same song at same time
PRIZM - Intelligent music player that you can plug into any speakers
DiscVibe - Create personalized and contextualized Spotify playlists
Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
Ranked Records - Create Spotify playlists with all an artist's songs