Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
Magic Playlist - Get the playlist of your dreams based on a song
Plotify - Spotify playlists from movie plots 🍿🎶
Spotalike - Spotify playlist with similar songs, according to Last.fm
Spotify - Map shows when two people play same song at same time
Playlist Machinery - Tools that help you create & organize your Spotify playlists