Silex is a free and open source website builder and HTML5 editor in the cloud. Create websites directly in the browser without writing code. And it is suitable for professional designers to produce great websites without constraints.
It comes with a rich WYSIWYG editor with full drag-and-drop support, export functionalities and browser compatibility with all modern browsers.
Silex is also can be installed on the local machine, but it requires Node.js to be installed.