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Total Validator is an (X)HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool allowing one-click validation of your entire site.

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

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Joomla templates by Joomlashack, a provider of custom, free and commercial Joomla Templates

The biValidator, this website helps you check the markup and style validity of your pages on the same time.

Web development tutorials, examples, exercises, quizzes, reference and much more for various languages including HTML, XML, CSS, Javascript, and PHP

CSE HTML Validator is a powerful and easy to use offline HTML, XHTML, CSS, JavaScript, and PHP syntax checker, HTML validator, XHTML validator, accessibility checker, and link checker for Microsoft Windows. A free edition is also available.

Web Design and HTML are all about creating a great Web site. Use Web development and Web site design to build Web sites that customers return to over and over again. On this site learn the basics of Web design, HTML, XML, and Web development.

Covers product updates, company updates and useful information on accessibility, browser compatibility and search engine optimization (SEO).