Editix
Editix
http://www.editix.com/
Exchanger
Exchanger xml editor is a professional multi platform xml development environment which allows for validation, transformation, viewing and editing of xml in 4 different views, with extensive support for xml schema, relaxng and dtd based editing, tag prompting and validation.
http://www.exchangerxml.com/
MoreMotion
MoreMotion
http://www.moremotion.com/webdesigner/index.html
Oxygen
Oxygen is a cross platform xml editor providing tools for xml authoring, xml conversion, and xsl, xslt, xquery, xml schema, dtd, relax ng and schematron development, soap and wsdl.
http://www.oxygenxml.com/
XMLSpy
Altova xmlspy includes an advanced xslt editor, profiler, and debugger that supports xslt 1.0 and 2.0 and offers numerous features that facilitate quick, error-free stylesheet development.”
http://www.altova.com/products/xmlspy/xsl_xslt_editor.html