HEATKEYS

W3C

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

A free HTML syntax checker for Microsoft Windows from the developers of CSE HTML Validator Professional.

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HTMLHelp.com is maintained by the Web Design Group to provide Web authoring reference material, tips, and answers to frequently asked questions.

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.

Free programmers

SitePoint.com - With a vast variety of web design tutorials and articles coupled with a vibrant and well informed community, SitePoint the natural place to go to grow your online business

Tools you can use, by Jonathan Hedley

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.

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.

Free html tutorials and help, images, color codes and more for the web developer. Featuring tutorials on HTML tags, programming, basics, JavaScript, frames, hex codes and more. Our weekly newsletter provides the latest information for developers.

Web SEO Analytics Offers Professional SEO Tools, a SEM Toolbox & Free SEO Analysis. Learn about Search Engine Optimization, SEO Tips & news on our Online Marketing Blog.