http://webconfs.com
Seo tools are available.

http://www.domainsearch.com/
http://www.domaintools.com
Domain result analysis tool here.

http://siteexplorer.search.yahoo.com/
Tools for knowing yahoo links.

http://www.sitereportcard.com
Tools for Broken Link & Spell Check Error and many more...

http://www.texttrust.com/public/free-trial.aspx
Spell check tool.

http://www.backlinkwatch.com/index.php
Present back link check tool.

http://browsershots.org/
For Browser Compartibility.

http://www.copyscape.com
For Duplicate Content Checking.

http://tools.seobook.com/general/website-comparison/
For Page Assessment Report.

http://www.marketleap.com
This tool is for linkpopularity.

http://easyinternetjobs.blogspot.com
More about google adsence and adwords..

http://www.onewaytextlink.com/links.php?type=free
p0-p9 directory list.

http://www.googlecashkey.com/
More read about PPC and Ads process.

http://ranking-seo.blogspot.com/
Definition of seo works.

http://www.pimpmysearch.com.
Make your own search box like google.