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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.

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!

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.

The web, animation and midlets developers resource.

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...

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.