Best for

People with large e-book collections who want to organize metadata, convert formats, and send books to any reader.

Why it deserves attention

Calibre has been maintained since 2006, is GPL-3.0, and has more than 26,000 GitHub stars. It catalogs a library with covers, metadata, tags, and custom columns; converts between EPUB, MOBI, AZW3, PDF, and dozens of other formats; and includes a viewer, an EPUB editor, and a news recipe engine that turns sites into scheduled e-books. A built-in content server shares the library over the web, and device drivers send books to Kindle, Kobo, and other readers over USB or the network. The trade-off is a dense desktop interface, no official mobile app, and advanced de-DRM workflows that depend on third-party plugins and local law.

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Can replace

Adobe Digital Editions

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