XSLT Editor
With <oXygen/> XSL Editor you can easily create, edit, test and validate your
XSLT documents.
Dragging elements from the XSLT Input view into the XSL document is a quick way
of creating templates or other XSL elements.

Other screenshots:
WYSIWYG XML Editor
Document Type Toolbar Customization
XML Grid Editor
Oxygen XML Editor in Japanese
Comparing Directories
Comparing XML Files
The Tree Editor
Visual XML Schema Editor
Logical Model View
Visual RelaxNG Schema Editor
XML Database Perspective
SVN Client
WYSIWYG DocBook editor
WYSIWYG DITA editor
WYSIWYG TEI editor
WYSIWYG XHTML editor
A Custom Layout for Views
A Custom Layout for Editors
Print Preview
XSLT debugger perspective