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English Dictionary Offline: https://play.google.com/store/apps/details?id=livio.pack.lang.en_US . Still unbloated after all these years.
Librera (ebook reader): https://f-droid.org/en/packages/com.foobnix.pro.pdf.reader/ . The pro version is free on f-droid, or you can buy it on Google Play if you want to support the dev.
Fossify Gallery: https://f-droid.org/en/packages/org.fossify.gallery/ . This is a fork of the old Simple Gallery from before it got bought out. Same deal with Fossify File Manager and the other Fossify apps. Just no-nonsense functional apps.
Librera (ebook reader)
Does it do OPDS for Calibre integration? I don't see that in the features.
I don't use this feature much so I can't speak to the details, but yes, it does support OPDS.
Screenshot:
I might give it a try then, Calibre library support builtin is a dealbreaker for me and it wasn't obvious in the description.
Thanks.