It is very important for search engine marketer to know that using which keywords peoples are comoing on your site.how popular any keyword is and so on...
3. Overture Suggestion :- Tools By yahoo overture.
4. Link Analyzer :- Analyze the ratio of internal liinks vs. external links. This is a good tool when determining page rank leakage.
6. Link City: -This place has EVERY tool under the sun for everything you could ever possibly want
7. Link Reputation :- (Reveals baclinks pointing to the target URL along with a link survey for eack backlink.)
8. Google PR Tools :-This guy has tons of fantastic tools. He is not as popular as some of the rest but the tools are great
9. Niche bot:-tool that will find relative keywords for any keyword search.
11. SEO-Toys :-These are some things that I had in my favorites. Some of them are okay.
12. Multiple SEO Tools :-This website has a variety of misc. tools on it that you can use to better your search engine rankings.
13. Bot Spotter :-This is a phenomenal script that will track what bots hit your website at what times. (Runs on PHP enabled websites)
15. Statcounter :-This will track your clients throughout the dynamically created pages of your website. This is a free service. (of course I don't have to mention this to you guys)
16. Page Rank Calculation: -Calculate google PR