One of the best free keyword research tools in the Web. It cross references Yahoo!, Google, WordTracker, Keyword Discovery, Region Search Estimates and Bid Prices. Use the Keyword Research Tool now!

This tool displays the creation date for a domain name. Domain age has recently become an important factor in Google ranking. Domain longevity allows sorting out established quality websites from recently created spam or low-quality domains.

The tool is designed to satisfy the curiosity of webmasters, surfers and web marketing professionals seeking a better metric to quickly assess a site/page’s relative importance and visibility.

Do you want to know how the number of your backlinks at each of Google’s datacenters? Since the active servers do not update in any predictable way, it can be helpful for SEOs to observe various individual active servers for search engine optimization purposes.

This neat software allows viewing essential SEO data in two mouse clicks. Installed as a plugin to Mozilla Firefox (if you don’t use Firefox you can download it here ) it enables you to see PageRank, Alexa Ranking, backlinks and indexed pages in Google, Yahoo! and MSN. It is also able to calculate density for any keyword or keyphrase you select on a page. Other features include highlighting nofollow links, displaying meta tags and contents of robots.txt file, and showing entires for a page in Archive.org.

Want to know why Google or Yahoo! ranks pages? If so this is the Firefox extension for you. SEO for Firefox pulls in many useful marketing data points to make it easy get a more holistic view of the competitive landscape of a market right from the search results.