I am looking for a WYSIWYG/GUI eBook editor that has robust functionality beyond that of Calibre or Sigil. I am speaking of the ability to edit many of the HTML elements via GUI without touching a line of code, adding interactivity (forms, quizzes) and complete formatting control.
I have found software such as Jutoh and Kotobee (even Kitaboo)? Are they comparable? Any other eBook editing tools that provide robust editing features from a GUI? This is not to exclude the ability of HTML/CSS editing, but I am looking for something that could allow feature rich eBook editing/creation without needing to code those sorts of elements.