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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.

W3C

Online tools for developers, including formatters (JSON, XML, HTML, SQL, etc.), minifiers (JavaScript, CSS), validators, compactors and many more!

Tools to allow simple testing of xpath expressions online on live XML content

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

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.

soapUI, is the world leading Open Source Functional Testing tool for Web Service Testing. It supports multiple protocols such as SOAP, REST, HTTP, JMS, AMF and JDBC. soapUI is from eviware, the Open Source TestWare Company.

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.

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...