Calibre is a free and open source e-book library management application developed by users of e-books for users of e-books. Calibre is an e-book library manager. It can view, convert and, Organise, convert, and manage your eBooks effortlessly with Calibre—a powerful, free tool that puts you in control of your entire digital library. For Windows, macOS and Linux computer systems., Calibre allows you to organize your e-books into virtual libraries, sort and filter by author, genre, publisher, or custom tags. Its powerful search and metadata tools let you find any book in seconds, regardless of the size of your collection., So if you’ve never used Calibre before and you have books to manage, here is all you need to know to get started with Calibre and set up your very own digital library., calibre is a powerful and easy to use e-book manager. Users say it’s outstanding and a must-have. It’ll allow you to do nearly everything and it takes things a step beyond normal e-book software. It’s also completely free and open source and great for both casual users and computer experts., Before calibre can do anything with your e-books, it first has to know about them. Drag and drop a few e-book files into calibre, or click the “Add books” button and browse for the e-books you want to work with..