Sigil  1.4.2
About: Sigil is a multi-platform EPUB ebook editor that supports both WYSIWYG and code-based editing of EPUB files, as well as the import of HTML and plain text files.
  Fossies Dox: Sigil-1.4.2.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

Sigil Documentation

The conversion of all source comments to Doxygen format is in progress. Some files have been converted, others have not.

Be patient.