Find the strongest pages on your site in terms of keywords on SEOmoz. Free registration required.   Related posts: Show Related Posts in WordPress Link Popularity Checker Keyword Suggestions Tool

Get meta tags info, recommendations on how to improve them and lots of info on the keywords on your website, incl. most popular anchor text, keyword density and more at SubmitExpress.   Related posts: Keyword Density Checker Free Keyword Density And Proximity Analyzer Meta Tags Generator

Wikipedia is widely popular – and has made its visitor stats available: Wikirank shows popular pages on Wikipedia which may suggest a trend on the web, or just on WIkipedia? How will you use it?   Related posts: Show Related Posts in WordPress Finding Keyword From Questions Keyword Trends

Cloaking detector, simulates Googlebot: find out if content presented to the web crawler is different from what’s presented to the user.     Related posts: Show Related Posts in WordPress Search Engine Spider Simulator The Lamest On Facebook

Linkvendor’s analysis tool shows link popularity on major search engines, Alexa, PageRank, and Compete ranks, and Spamhaus blocked pages. It also shows if your domain is listed in the DMOZ and Yahoo directory. Related posts: Link Popularity Checker Free SEO Analysis Tool Search Engine Spider Simulator

This analyzing tool shows lots of data, but seems most useful for analyzing metatags and showing keywords.     Related posts: Finding Keyword From Questions Keyword Suggestions For Your Website Keyword Trends

If you have lots of images on your page or you’re working on a redesign, periodically test the total loading time on Pingdom in order to tweak your page.   Related posts: Show Related Posts in WordPress Loaders.css Measure Loading Time Of Your Website’s Pages