GitHub - Pokes303/youtube-dl-GUI: Download videos from YouTube. Based on youtube-dl script:
How to Download MP3 Tracks from a YouTube Video Using YouTube-DL
GitHub - jweslley/youtube-dl-mp3: Downloads videos from YouTube and convert them to mp3.
GitHub - S-Ruban/youtube-dl: A simple Tkinter app used to convert Youtube videos to "*.mp3" or "*.mp4" using the "youtube-dl.exe" and "ffmpeg.exe" libraries
MP3Studio YouTube Downloader 2.0.18 ダウンロード
How to Download Audio Only Using youtube-dl
Mac および PC 用の YouTube ダウンローダー - 効率的で信頼性の高いアプリ
command line - How to download playlist to mp3 format with youtube-dl? - Ask Ubuntu