Calibre

Calibre is the ultimate, free, and open-source toolkit for all your ebook needs. Users call it outstanding because it empowers you to do nearly everything. Manage massive collections, convert files for any e-reader, download news, and use the integrated viewer. The software includes editing capabilities for perfecting your books and simple options for sharing and backup. Designed to be powerful yet easy to use, Calibre is the go-to solution that satisfies both casual users and computer experts, taking ebook software to the next level.