SEO tools
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Enterprise web-class analysis made Smarter,friendlier and free
Google Analytics is the enterprise-class web analytics solution that gives you rich insights into your website traffic and marketing effectiveness. Powerful, flexible and easy-to-use features now let you see and analyze your traffic data in an entirely new way. With Google Analytics, you're more prepared to write better-targeted ads, strengthen your marketing initiatives and create higher converting websites.
Link: http://www.google.com/analytics

Free validator check the markup of a document
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.
Link: http://validator.w3.org/

- FREE Create an XML sitemap that can be submitted to Google, Bing, Yahoo and other search engines to help them crawl your website.
XML sitemap
Link: http://www.xml-sitemaps.com