Audioship - Upload audio to YouTube or Facebook
Magic Playlist - Get the playlist of your dreams based on a song
Move to Apple Music - Convert your Spotify playlists for Apple Music
Spotalike - Spotify playlist with similar songs, according to Last.fm
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format
Playlist Machinery - Tools that help you create & organize your Spotify playlists