There have been some questions recently about Fosfor, the open source EPUB tool that I started creating some time ago. Well, it's been rearchitected from scratch and now includes the WYSIWYG editor based on JavaFX that I blogged about over the past days:
I ended up abandoning the WebView and went with the HTMLEditor, despite its problems, e.g., problems displaying images within HTML. Hoping to workaround that somehow, right now hardcoded for the screenshot above, probably need a File Protocol URLStreamHandler.
More info about this in the coming days and I will be updating the open source repository as well with all the new code.