spotify-dl is a Python script that gets a list of songs from Spotify playlist (or album) and downloads them using YouTube-DL (well, youtube-dlp actually now).
It started off to scratch an itch, but many of the features were requested for/developed by community. I don’t really use it a lot now given I have Spotify Premium but it is still quite popular (crossed 1k GitHub stars, included in AUR), so I try to maintain it whenever I can.