Wikipedia
Xeditor
Xeditor is a web-based XML editor with a WYSIWYG interface. It hides the XML-code in the background and presents the content in a more user-friendly format. The frontend is similar to Microsoft Word.
The editor offers support for XML standards ( DITA / DocBook / S1000D / TEI / JATS). Thanks to WIRIS the author can edit and display mathematical formulas in MathML. The JavaScript architecture is based on ExtJS.