Monopoly or not, it's the only wsywyg text editor I've ever found truly usable. I now prefer Google docs for convenience but it's not quite there yet for composition/edit experience. Hoping for more good alternatives, if anyone has suggestions.
LyX isn't WYSIWYG but rather WYSIWYM (the "M" stands for "mean"), but I found it the most usable visual editor for word processing. Edit: Why the downvote?
(I did not downvote nor think there's reason enough for it. Just speculating)
I took a look at the LyX web page, and it really didn't shed much light on the issue. "writing based on the structure of your document" added zero information to me. The screenshots look like a weird middle ground between WYSIWYG and TeX.