CKEditor is a browser-based WYSIWYG content editor. This means the content being edited in it looks as similar as possible to the results end users will see after it has been published. It brings to the web common word processor features found in desktop editing applications like Microsoft Word and OpenOffice. Several application in wityCMS use CKEditor tool.
(CKEditor V4.0). (CKEditor documentation).
CKEditor is distributed under the GPL, LGPL, and MPL Open Source licenses. To learn more about licensing, please refer to the official website.