title_body: Rich e-book authoring, other than iBooks Author?
upvoted_answer: Well it is not entirely true. I have made some ePub3 eBooks with user interaction back in 2013. You can use JavaScript to do the job. Problem was than there are wasn't many readers which could use it. Now we have readium and ADE4 with ePub3 so things may be different. Still it was for ePub3 not kindle eBooks.