Free XML Tools
XML Viewer
MindFusion's XML Viewer is a freeware program used to examine the contents of an XML file in an easy-to-use environment. In addition you can make modification to the XML such as inserting or deleting items or properties.
Exchanger XML Lite V3.2
Exchanger XML Lite is a Java-based product that provides comprehensive functionality for viewing, authoring and editing XML data and documents. The Exchanger XML Lite edition is for use only in non-commercial environments.
XmEdiL
XmEdiL is free document editor for XML and other languages. Provides standard Windows interface, validation, transformations, XPath builder, language editor, entry helpers, autocomplete, intellisense, projects, syntax colorizing, W3C conformant.
XMLStarlet Command Line XML Toolkit
XMLStarlet is a set of command line utilities (tools) which can be used to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for plain text files using UNIX grep, sed, awk, diff, patch, join, etc commands.
Cooktop
Cooktop is a free xml editor for windows and development environment for XML, DTD, and XSLT documents
Peter's XML editor v2.0
Microsoft XML parser MSXML 4.0 is needed to run this software. This can be installed by selecting the custom setup option.
GenDoc
GenDoc is an open source XML editor written in Java2. It is based on a existing project (MerlotXML), and can use two kinds of plugins (DTD and/or action). The DTD plugin can be used to customize the editor for a DTD, and an action plugin can be used to publish documents in HTML or PDF format.
Python XmlTools
Python XmlTools is a set of high level tools to help using XML in python. It relies heavily on PyXml and 4Suite to access XML resources
xmloperator : an XML editor
xmloperator is an XML editor, suitable for editing data oriented documents. The software is open source, Java written, released under a BSD-style license. It requires J2SE 1.4 and uses Xerces-J, Xalan-J and Ant from the Apache Software Fondation.
XED
XED is a text editor for XML document instances. It is designed to support hand-authoring of small-to-medium size XML documents, and is optimised for keyboard input. There are beta versions for windows, solaris, freebsd and linux.
Visual XML
Visual XML is a tool that enables you to create and modify DTD and XML documents. It appears to be a java application in beta form.