calibre

calibre screenshots

Manage your e-book collection, edit them, and convert e-books between formats
Main Window
calibre 3.7 : Main Window

Alternative downloads

Epub Reader for Windows
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Simple utility to read EPUB e-books with some conversion capabilities.
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Straightforward e-book conversion tool with support for the most used formats.
Epubor Kindle Transfer
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Straightforward app to transfer e-books from your PC to your Kindle or Kobo.