Here is a list of free SEO tools:

1) http://www.iwebtool.com/

A lot of good free tools you can find there:

2) http://www.linkvendor.com/

 As a professional and personal free seo tools

3) http://www.hscripts.com/tools/HLPC/index.php

 Useful for Link Popularity Checker/Analyzer.

Monitor the growth of your website and webpage in the most used search engines.

4) http://www.seotoolset.com/tools/free_tools.html  

5) http://www.free-tools.org/

6) http://www.toptenranks.com/free-seo-tools/professional-seo-tools.html  

Professional Free Seo Tools 

7) http://www.seochat.com/

Good resource for SEO

8) http://tools.webmastershome.com/  

 Web master tools for SEO

 9) http://www.seotoolset.com/tools/free_tools.html

SEO Tools, Training and Certification for Internet Professionals