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Kindle Is Making It Harder to Switch to Rival eReader Brands.
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
IIRC it’s not as feature complete as the fat client
This. I've personally found it easiest to use Calibre to strip DRM & get things tidy, then use Audiobookshelf to manage both my ebooks and audiobooks
It does ebooks too?