Years ago, when I wrote my thesis, I looked into a project called Sciwriter from a company called soft4science. It was well integrated with LaTeX and it seemed very powerful and structured. It wasn't the intention, I think, but for a big part it looked like it could become finally a decent WYSIWYG LaTeX editor. It even looked better than LyX or TeXmacs at the time.
Do you know what happened with that project, did it change name or was it integrated into another project?
Here it is a screenshot I could find online.
From @touhami comment I could also find what looks like a very similar project, called ScientificAuthor available at CTAN. I created this screenshot: