HEATKEYS

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.

HTML XHTML CSS JavaScript XML XSL ASP SQL ADO VBScript Tutorials References Examples

Code Beautify hepls to edit, minify,beautify,export web code like CSS,HTML,JSON,XML,RSS,XMLtoJSON,JSONtoXML,CSVtoJSON,CSVtoXML,XMLtoCSV,JSONtoCSV convter, viewer,beautify and minifier,editor and Create robots.txt,sitemap

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

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.

W3C

For Focused .NET/XML and Web Services Training Visit the XML for ASP.NET Developers Website: http://www.xmlforasp.net

Collection of utilities frequently needed in web development, such as testing URL encode/decode, HTML encode/decode, generating runtime classes from a XSD or a JSON string and many more

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