EditiX is a powerful and easy to use XML editor, Visual Schema Editor, XQuery Editor and XSLT debugger for Windows, Linux and Mac OS X designed to help web authors and application programmers take advantage of the latest XML and XML-related technologies such as XSLT / FO, DocBook and XSD Schema.
"This is really a great app for creating and developing XML-based documents"
Rüdiger Weiß-Mazzoni
"useful and professional XML editor"
Eyal Katz