You already know about WordPress Visual editor and HTML editor, they all works in the back-end. Here we are discussing about new WP Smart Editor that works directly in Post Preview Mode which means you can directly edit, write and customize your post content from its preview page itself using this new post editor.
If you are looking for a powerful HTML editor and previewer which you can use for good WYSIWYG HTML and CSS editing then Kompozer is the best free option for you. It is widely popular as a complete web authoring platform which includes web file management and easy WYSIWYG web page editing features which you might have seen in FrontPage, Adobe DreamWeaver and other programs.
Using Content Mirror plugin you can easily mirror your WordPress site content from one page or post to another, even you can do this between subsites in a WordPress multisite network.
WP Editor is a powerful WordPress plugin that replaces the default WP plugin, theme including the page/post editor with new fast AJAX powered editors that provides you a rich working environ. The plugin completely reworks default WordPress file editing capabilities using AJAX to retrieve files and folders. WP Editor automatically sets a new standard for speed and reliability in a web-based editing atmosphere.
The tutorial is on adding a new Webmaster user role which comes in between your site Administrator and Editor. This user is same as site Administrator but it excludes some capabilities like managing plugins, changing themes. Users with this role will not be able to install or activate any theme or plugin. They can change the widgets, edit theme options like background, header images etc if your theme provides and do all other things which a site admin does.