While technically a text editor, its Live Preview feature provides a WYSIWYG-like experience by highlighting exactly what your code is changing in a browser window. Modern "Headless" Editors for Developers
An installable editor for Mac that is completely free of charge and focuses on creating fully responsive websites in the fastest way possible. Free and Open-Source Options Wysiwyg Html Editors For Mac
The industry standard for years, Dreamweaver offers a split-view interface where you can see changes in real-time as you design or code. It integrates seamlessly with other Adobe Creative Cloud apps like Photoshop. While technically a text editor, its Live Preview