Back Link Analyzer -This one comes from SEO Book. It is absolutely free and functions similar too Opti Link and SEO Elite.

Hundreds of Free SEO Tools - This page lists about 136 free search engine tools. Many of these are free. Overall, a very good collection

SEO Surf - This free tool optimize your websites for search engines, manage link exchanges and promote your website for more visitors and traffic.

WebCEO - Its 12 tools help you promote your site in search engines, analyze your traffic, and maintain your online property. [Read more...]

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