Let me add your suggestions
Namida uses ytdlp extractor
https://github.com/namidaco/namida
Pipepipe beta 5.0 uses ytdlp extractor
https://github.com/InfinityLoop1308/PipePipe
Aio video downloader uses ytdlp
For YouTube check out yt-dlp. It can liberate videos from yt & hundreds of other sites.
https://github.com/yt-dlp/yt-dlp
Android version has a nice GUI with an easy "share to" workflow
https://github.com/deniscerri/ytdlnis
Pipepipe is a good app too
https://github.com/InfinityLoop1308/PipePipe
For books check out Anna's Archive
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