I was looking for that a while back, too, and a Wikipedia search led me to BlueGriffon (http://bluegriffon.org/), which (through various forks like Nvu etc.) was apparently originally based on the "Composer" part of Netscape / Mozilla.
Hell are there good WYSIWYG website editors nowadays at any price?
Dunno depends on what you like, I liked Microsoft Expression Web and that seemed to be free but they discontinued it. I would love to see VS Code become a reasonable WYSIWYG editor for Markdown and HTML5 / CSS though. I have seen some Electron based editors for Bootstrap that are very good, trick is to do an HTML WYSIWYG editor you really do need a damn browser component to do it properly enough. I would also like to see Mozilla create something similar for Firefox Developer Edition, not just more JS editors.
SeaMonkey (used to be Mozilla) Composer is free and WYSIWYG but the website you make will be very 90s looking.