WordPress is the leading and best supported website building software.  It’s open source, so it’s free.  This site is built with WordPress which shows just how versatile WordPress is.  There are tens of thousands of Themes which give the style and structure to the site.  There are tens of thousands of Plugins which offer additional functionality–this course, for example, uses a lesson plan Plugin.  The main reason I like WordPress is that with so many of its features, I find myself saying, “They really couldn’t have made that any easier.”