1. Google Webmaster Central
Your one-stop shop for webmaster resources that will help you with your crawling and indexing questions, introduce you to offerings that can enhance and increase traffic to your site, and connect you with your visitors.
http://www.google.com/webmasters

2. Desktop.google.com
Info when you want it, right on your desktop.
http://desktop.google.com

3. Maps.google.com
Search the map, find businesses and get directions with Google Maps
http://maps.google.com

4. Google.com Cse Page
Have a website or collection of sites you'd like to search over? With Custom Search Engine, you can harness the power of Google to create a search engine tailored to your needs.
http://www.google.com/cse

5. Googlerankings.com Ultimate_seo_tool Page
Check your position in the search engine of Google . We monitor your ranking for free, anytime, for any domain and keyword.
http://www.googlerankings.com/ultimate_seo_tool.p~

6. Sitening.com Seo-tools Page
Designed for both casual and professional use, our tools power modern SEO
http://www.sitening.com/seo-tools

7. Twellow.com
Twitter users organized into business categories. Search for Twitterers and find new ones to follow based on common interests.
http://www.twellow.com

8. CyberSiteSearch
CyberSiteSearch site search tools, merchandising & search marketing features increase traffic and sales for online e-commerce websites of all sizes.
http://cybersitesearch.com

9. Linkvendor.com Seo-tools Serps-position Page
With the keyword position analysis you can check on which position your domain is ranked for a given keyword and compare the first 100 results by Google, MSN and Yahoo.
http://www.linkvendor.com/seo-tools/serps-positio~

10. Marketleap.com Publinkpop Page
Link Popularity Check - Link popularity analysis is one of the best ways to quantifiably and independently measure your website's online awareness and overall visibility. Marketleap Visibility Index
http://www.marketleap.com/publinkpop

11. Xml-sitemaps.com Se-bot-simulator Page
Search Engine Robot Simulator - SEO Tool to simulate search engine parsing of webpages and display discovered links.
http://www.xml-sitemaps.com/se-bot-simulator.html

12. Linkvendor.com Seo-tools Se-spider Page
With the spiderview simulator you see all informations a search engine spider receive from a website.
http://www.linkvendor.com/seo-tools/se-spider.html

13. Seomoz.org Page-strength Page
The Page Strength Tool from SEOmoz provides 14 factors that may influence a page's ability to perform in the major engines.
http://www.seomoz.org/page-strength

15. Freekeywords.wordtracker.com
Use the free keyword suggestion tool from Wordtracker to help your website rank higher in the search engines.
http://freekeywords.wordtracker.com