I don’t expect many responses as this is a niche topic, but I would still like to get some answers. :-)
For example, EinkBro seems to be a good choice. https://einkbro.github.io/overview.html
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KOReader for books, and Mihon for manga and comics. KOReader is spefically designed for e-ink displays, and Mihon has a setting to flash the display when changing pages to reduce ghosting on e-ink displays.
Recently F-droid has gained Kahon (Mihon light fork, easy to import settings and reuse the folders), works great!
KoReader is great!




