Calibre

Calibre is an open-source e-book library management application that enables users to view, convert, and organize e-books in various formats. It is a free and cross-platform software that can be used on Windows, macOS, and Linux. Calibre has a user-friendly interface that allows users to manage their e-books easily. It also has a built-in e-book viewer that supports various formats such as EPUB, MOBI, PDF, and many more.
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