100% Free YouTube Playlist to MP3 Downloader: Download Entire Playlist
Developer Submission: Playlist Converter now accepts YouTube playlists and can export playlists - MSPoweruser
Convert playlists from spotify to youtube tutorial
GitHub - nikolinaneric/Youtube-to-Spotify-playlist-converter: An app that will iterate through youtube playlist you like and make the same playlist on your Spotify account
Free & Quick] How to Convert YouTube Playlist to MP3 - EaseUS