KOReader + BookOrbit (or Calibe or whatever you like best) is awesome.

KOReader is finicky to configure but once you have it set up its hands down the best experience. I use BookShelf as my main UI and BookEnds to configure the header/footer. I also use KOAssistant which lets you select text and chuck it at an LLM to explain/translate/custom-prompt/etc.

It was so nice when reading the Horatio Hornblower series where the old references or nautical terms were foreign to me. Just select a phrase, hit Explain, and in seconds get an LLM response right there on my kindle. Just like how the dictionary works (though obviously the LLM isn’t running locally).

With BookOrbit tracking my reading/annotations and providing my ebooks I’ve reached my perfect reading setup. Using Claude to configure some ESP32-based e-Ink screens to rotate book quotes I’ve personally highlighted in KOReader is peak self-hosted, super custom just tor me.

I’m so glad my coworker encouraged me to go down this route!