I've seen TeXworks, but it's different than TeXmacs, which is real WYSIWYG editing with a TeX-like layout engine. TeXworks is still very cool, though.
Re:The TeX tuneup of 2014 [pdf]
by jimhefferon on Monday April 28, 2014 @06:59AM
(#7659160)
> real WYSIWYG editing
That's an argument against using it, it seems to me. Having the words jump around as you type them is maddening.
https://www.tug.org/texworks/
You can also click somewhere in the PDF view and 'jump to source'. Used it a few times when polishing/debugging a LaTeX document, I generally don't use it for writing though. (I prefer to do all my writing in Vim).