HEATKEYS

Free cross-platform web-based Online XML Editor, runs on Linux, Windows, Mac, FireFox, Chrome, IE. Edit XML schema or document. No user registration required.

Altova XMLSpy XML editor, plus other leading XML, data management, UML, and Web services software tools for application, web site, and database development, data conversion, and more.

The Stylus Studio XML Editor is an innovative XML IDE providing advanced XML development tools for XML, XSL, XSLT, XML Schema, DTD, SOAP, WSDL, SQL/XML, XML mapping, Web services and XQuery, simplifying XML data integration.

oXygen XML Editor is a cross platform XML Editor providing tools for XML authoring, XML conversion, XSL, XSLT, XQuery, XML Schema, DTD, Relax NG and Schematron development, SOAP and WSDL.

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

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The definitive reference for Web developers with tutorials on all aspects of Web design and authoring, including JavaScript, DHTML, 3D animation, CSS, RSS, XML, design, Flash and more.

A web-based XML validator. Can be used for free. Validates XML files, prompts the user for referenced files (e. g., XSD), shows good error messages.