calibre alternatives

Open source

Programs you can use instead of calibre. Free and open-source options come first; every download is from the publisher's official source.

• SumatraPDF SumatraPDF is a free, open-source multi-format document reader created by Krzysztof Kowalczyk for Windows. Shared platforms: Windows Windows

Other alternatives not on the site yet: Sigil, Foliate

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