XMLwriter XML Editor 

XMLwriter is a powerful XML editor for Windows designed to help web authors and web application programmers take advantage of the latest XML and XML-related technologies such as XSLT and XSD Schemas.
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XmlShell - The Ultimate Lightweight XML Editor 

The Ultimate Lightweight XML Editor: 1.True side-by-side XML tree structural view and table/editor/browser views. 2.Grid-like table views to display table-like XML data. 3.Syntax-colored free-form text editor. 4.Intelligent popup list in editor.
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Stylus Studio XML Enterprise Edition 

Stylus Studio XML IDE features XML Editing, Debugging, Testing/Benchmarking & Deployment Tools for any XML technology, including XML Schema, DTD, XSL/XSLT, XPath, XQuery, XML Mapping, Web Services, SQL/XML, EDI, Legacy Data Integration and more.
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