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Calibre
Calibre is a comprehensive e‑book management suite that enables users to build virtual libraries, convert between formats (like EPUB, MOBI, PDF), edit metadata, and sync with popular e‑readers. It features a built-in reader, content downloader, and robust plugin system, all wrapped in a user-friendly interface that supports Windows, macOS, and Linux. With over 15 years of development and millions of active users, it’s a trusted tool for book lovers and digital librarians alike.