Hi.

I'm proud to show you my project for managing large libraries of FB2 ebooks: https://bitbucket.org/tkatchev/flibby

It supports full-text indexing of huge (hundreds of thousands of books) ebook libraries, searching the index, exporting books, reading them, and converting to PDF.

This is a console-only application and only FB2 format ebooks are supported.

Tested only on Linux and FreeBSD. (But theoretically could work on MacOS and WIndows too, eventually.)