Playlistor - Convert Apple Music playlists to Spotify and vice versa
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Some Good Records - Find your new record from the most interesting people
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
Magic Playlist - Get the playlist of your dreams based on a song
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format