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Calibre (pronounced cal-i-ber) is a cross-platform free and open-source suite of e-book software. Calibre supports organizing existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers. Editing books is supported for EPUB and AZW3 formats.
The EPUB format is the most widely supported e-book format, supported by most e-book readers except Amazon Kindle [a] devices. Most e-book readers also support the PDF and plain text formats. E-book software can be used to convert e-books from one format to another, as well as to create, edit and publish e-books.
E-Book services: Most document types listed above may be converted into the popular EPUB and Mobi Pocket (Amazon Kindle) e-book formats. The service also supports conversion of documents into the EPUB3 format, including EPUB3 books with media overlay. Furthermore, EPUB may be converted to Mobi Pocket and vice versa.
Sigil is free, open-source editing software for e-books in the EPUB format. As a cross-platform application, Sigil is distributed for the Windows, macOS, Haiku and Linux platforms under the GNU GPL license. Sigil supports code-based editing of EPUB files, as well as the import of HTML and plain text files.
E-book software is available for many platforms in both paid, proprietary as well as free, open source form. List of e-book software. Software Open Source
Kindle File Format is a proprietary e-book file format created by Amazon.com that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers that have Amazon's Kindle app. E-book files in the Kindle File Format originally had the filename extension.azw; [a] version 8 (KF8) introduced HTML5 & CSS3 features and have the .azw3 extension, and version 10 introduced a ...
Kindle Vella was a serial publication platform, introduced in 2021 as a competitor to Wattpad and Radish, and discontinued in February 2025 [20]. Kindle Vella initially failed to attract as much popularity as its predecessors, although initially it was applauded by technology magazines such as GeekWire for "bringing books into the TikTok era". [21]
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]