Silex is a free website builder, that can be used directly in the browser. The skills needed to edit a website depend on what needs to be done : use the drag and drop / WYSIWYG interface to intuitively edit a website, or the integrated CSS and Javascript editors to add styles and interactivity to the elements.Silex is a free and open source alternative to proprietary website builders like Wix.com, Weebly, Jimdo or Squarespace.