

I use Audiobookshelf as the app support is great (allows downloading offline versions and progress syncs when you reconnect to internet). This works amazingly well with my Boox Palma 2 since it runs android.
I don’t download a ton of books, so I just have some simple Python scripts for organizing the content.

I run Kogma alongside AudioBookShelf, but have ended up reading most manga directly from AudioBookShelf. The reader is hit or miss, but syncing works great and you can download comics/books for when youre on the go (and it will also sync progress when you reconnect).
The major downside is AudioBookshelfs opinions on directory structure. Requires a fair amount of work reorganizing content.