WordTracker.com - No matter what business you are in, Wordtracker will tell you the words people use when they search - and how popular each word is. You will be able to Optimize your website content by using the most popular keywords for your product and services, generate thousands of relevant keywords to improve your organic and PPC search campaigns, you can also Research online markets, find niche opportunities and exploit them before your competitors

Keyword Discovery - Research on the number of times that each keyword or phrase has been searched for over the last 12 months. This free search tool uses data from the Keyword discovery Global Premium database.

Microsoft Keyword Forecast- This tool forecast the search volume and demographic predictions of your selected list of keywords.

Keyword Valuation tools - Get quick traffic estimates for new keywords without adding them to an account or using the AdWords sign-up wizard.

Compete.com - With compete.com, you will be able to identify rival search marketing strategies and take your SEO efforts up to the next level. it offers affordable competitive research reports.

Quantcast -Quantcast is the only open interent ratings service. They provide advertisers with audience profiles for millions of websites and services. They invite publishers to participate and demonstrate the unique value of their audiences. The service is free to everyone.

Alexa -Show charts for competing sites. Provides sites traffic zooming and comparison.

Site Meter - Site Meter Basic offers a FREE, easy to install tool for sites looking to beter understand who’s ivisting their site, where customers are coming from and where they are going within the site.

Google Analytics- Google Analytics has been re-designed to help you learn even more about where your visitors come from and how they interact with your site.

Piwik - piwik is an open source (GPL license) web analytics software. It gives interesting reports on your website visitors, your popular pages, the search engines keywords they used, the language they speak… and so much more.

StatCounter - A free yet reliable invisible web tracker, highly configurable hit counter and real-time detailed web stats. Insert a simple piece of our code on your web page or blog and you will be able to analyse and monitor all the visitors to your website in real-time! Started off a free site but later charge for advance features.

SEO for Firefox - The award-winning Web browser is now faster, more secure, and fully customizable to your online life. With Firefox 2, we’ve added powerful new features that make your online experience even better.

Xinu - Find out how well your site is doing in popular search engines, social bookmarking and other site statistics