Calibre-Web is a great open source web #ebook library that can be used by the whole family. I wrote a blog post about how to install it, set it up and use it (in Czech, but DeepL translates it well).
And thank you, @archos, for the tip. 😉
https://blog.eischmann.cz/2023/05/15/calibre-web-vlastni-knihovna-na-webu/