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EditiX is a quality XML and XSLT Editor for Windows, Mac OS X and Linux

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.

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.

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.

XML.com, where the XML community shares XML development resources and solutions, features timely news, opinions, features, and tutorials; the Annotated XML specification created by Tim Bray; authoring tools, XML developer resources, interactive forum...

Java XML Editor, MQSeries client, Schema, XMLSpear, XML Tree Editor, binary plist editor,property list editor, real-time validation, free download, best free XML editor

MOSO Xmplify is a powerful new XML editor built specifically for Mac OS X, with DTD and XML Schema-based auto-completion, automatic document validation, XSLT and XPath support, live HTML preview and much more.

XMLStarlet Command Line XML Toolkit

CollabNet, Facilitating Collaborative Software Development