calibre: Complete e-book library management system. 
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian.
Manage, convert, sync, and more
Library management. Calibre keeps things orderly by creating single entries for books that contains multiple formats. Add tags and comments for better searchability.
Format conversion. Calibre’s robust conversion options support
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