For those of you who may be unaware of the ePub format, it is an open e-book standard and files of this format have a file extension of.epub.Sigil is an advanced ePub editor, which provides numerous convenient viewing options, including Book view, Code View and Split View (which displays the e-book and code).
Sigil is a free cross-platform e-book editor for editing eBooks in ePub format.
