Calibre is a cross-platform open-source suite of e-book software by Kovid Goyal. Calibre supports organizing existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers. Editing books is supported for EPUB and AZW3 formats. In short, Calibre is a powerful and easy to use … Read more about How to Install Calibre on Your UGREEN NAS