I used Netscape Composer and then the similar component of SeaMonkey to maintain several static websites from around 2000 to 2015 or so. They were a bit buggy, but I was able to make them work well enough, and they produced much cleaner code than the other WYSIWYG editors I tried at the time.

I finally stopped using SeaMonkey when I felt the need to make my sites responsive. I now maintain my sites with a text editor and an FTP app, which work fine but feel like a step backward.