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EPUB (short for electronic publication ) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub .
Sigil is a multi-platform EPUB ebook editor with the following features
EpubCheck is a tool to validate IDPF EPUB files, version 2.0 and later. It can detect many types of errors in EPUB. OCF container structure, OPF and OPS mark-up, and internal reference consistency are checked.
Stanza Desktop is a small utility program to assist in converting your books from various formats into ePub, and to assist in transferring your books to Stanza iPhone/iPod Touch. Stanza Desktop currently supports reading books in a variety of unprotected formats (including HTML, plain text, Mobipocket), but note that books in protected formats (such as Kindle books, books protected with Adobe DRM, and protected Mobipocket books) cannot currently be read using Stanza Desktop. Stanza Desktop does not currently contain any library management features or the ability to download books directly from the internet.