title_body: Are there any WYSIWYG editors for EPUB books? I am looking for an easy to use editor that provides a WYSIWYG (“What You See Is What You Get”) interface. I know that you can import a Microsoft Word document into Calibre, but I would prefer to be able to edit an ePUB book using a robust editor. Does something like this exist?
upvoted_answer: When someone asks me what GUI to use I suggest Sigil. I find that Sigil, unlike it's alternatives, does not add unneeded code to your ePubs which cause bloating, errors, and slower viewing.
  
  Its code is also on github.