I agree with PHPGator doesn't matter whether you're #10 or #1, you still want to do more link building to either sustain your ranking or build it up some more....
The most wanted seo tool for me is google toolbar and seo book toolbar for my daily link building process as it helps to find the page rank and wether it is do follow or follow site..
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If you are serious - don't bother with free tools buy a cheap one instead. Market Samurai http://rankiac.com Good luck