Free XML Editors

Altova Authentic® 2007 Desktop Edition

http://www.altova.com/products/authentic/xml_document_editor.html
http://www.altova.com/simpledownload1.html

XML Marker

http://symbolclick.com/

XMLFox

http://www.xmlfox.com/

XML Pro

http://www.vervet.com/

Microsoft XML Notepad 2007

http://www.microsoft.com/downloads/details.aspx?familyid=72D6AA49-787D-4118-BA5F-4F30FE913628&displaylang=en

EuroMath2 WYSIWYG XML Editor
http://euromath2.sourceforge.net/userdocs/overview.html

XMetaL Author (30 day free trial)

http://www.xmetal.com/en_us/products/xmetal_author/index.x

Review of XML Editors
http://ahds.ac.uk/creating/information-papers/xml-editors/#section2