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These tools are great at giving a quick glance at how your Web site functions and how it could be improved. Some of my other favorites like this are Web site Grader, Compete, and SEM Rush.

Spyfu logo

SpyFu

What is it used for?

SpyFu is good at looking at organic search result rankings and paid search campaigns for competitors and your own site.

Submit express logoSubmit Express

What is it used for?

Submit Express is good for quickly looking at meta data, link popularity and html. It also has measures in place to determine how relevant keywords and descriptions are for each page.