EditiX: Cross-platform and multi-purpose XML editor and XSLT debugger. [Shareware]
Exchanger XML Editor: A Java-based XML editor that facilitates easy browsing, editing, managing and conversion of XML documents. By Cladonia Ltd. [Commercial]
GenDoc: A XML editor written in Java2 that can be specialize for a set of DTD. It is based on a existing project MerlotXML. [Open source]
Jaxe: A graphical Java XML editor customizable with an XML schema and a file describing the menus to insert the elements. [Open source, GPL]
NetBeans XML Project: XML editor plugin for Netbeans, the open source Java IDE. Supports both text mode and tree mode editing. [Open Source]
oXygen: With a code insight and a flexible approach to XML editing it allows users to manage all XML related documents.
Pollo: Tree-mode and text-mode XML editor with color-coding. Can read DTDs and many types of schemas to enhance editing. Built-in support for Cocoon sitemap files, Ant build files and XML Schemas. [Open Source, BSD-like]
Stylus Studio - Java and XML Tools: Tools for building XML-enabled Java/J2EE applications, including a JSP 1.0/2.0 editor, Java IDE, support for Java XML components including Xalan, Xerces, Saxon, and Java Web services. [Commercial]
TXE - The XML Editor: A GUI XML editor written in Java using the DOM (Document Object Model) parser provided by Oracle. [Freeware]
VisualXML: Java application to create and modify DTDs and XML documents. [Freeware]
XAmple: Java Swing-based XML editor that analyzes a given XML schema and then generates a document-specific graphical user interface. Generic XML configuration tool. Generic schema-driven data-entry form. [Open source]
Xeena: Generic Java application for editing valid XML documents derived from any valid DTD. (IBM Corporation)
Xerlin: An extensible Java based XML editor. [Open source]
XFlows: Cross-platform XML and XSLT Manager. [Shareware]
XML Pro: Java-based XML editor that supports DTD validation. [Commercial]
XMLmind XML Editor: Very good editor for structured documents (like DocBook XML). DTD-only version is free to use and comes with DocBook support. XML Schema enabled version is commercial available.
xmloperator: An XML editor for data oriented documents. Editing is guided by any DTD or RELAX NG schema. [Open Source, BSD-like]