The ARK Editor is an Open Source WYSIWYG editor, built upon the popular CKEditor. It's designed to simplify your content creation in Joomla!
It's user-friendly due to its modern 'Windows Metro' like interface, yet, configurable enough to be used for all website developments. It's highly customisable, allowing you to create bespoke toolbars, to adding functionality with new plugins, and content templating, you can configure its typography, and support user permissions and user folders. It's licenced under the General Public License and embodies the Joomla project and its values.