Free of charge Resources of available Webmaster Tools and Accessible Online Tests on the Internet
Dr. HTML. This widely-acclaimed program will scan your web pages for HTML errors, check for spelling mistakes, verify your hyperlinks, and provide other information useful for fine-tuning your Web page's performance. Go to Single Page Analysis.
W3C: W3C HTML Validation Service, This is an easy-to-use HTML validation service based on an SGML parser. It checks HTML documents for compliance with W3C HTML Recommendations and other HTML standards.
Addy & Associates: Dr. Watson. Dr. Watson is a free service to analyze your web page on the Internet. Watson can also check out many other aspects of your site, including link validity, download speed, search engine compatibility, and link popularity. At the moment it doesn´t work properly because of kbite restriction!
Imagiware: The HTML Formatter. The HTML Formatter will re-arrange your text and HTML into an easy-to-read layout which makes editing much easier. HTML Page Squisher. This program will take your HTML page and squeeze it by removingunnecessary characters. Doing so will shrink the number of bytes in your HTML page and make it download faster.
Link Exchange. SiteInspector.
link tool.com. Free Online Tools. Validate the HTML of your page.
Webmaster Resources: HTML (Hypertext Markup Language). An annotated index.