SEO Tools

Here is a collection of some cool SEO tools:

Keyword Spy - A nice online tool which helps you to find out what your competitors are doing on Google Adwords and spy on their keywords and Ad units.
Check-backlinks - A Free & Effective tool check the number of back links to your site as indexed by various popular search engines.
Free Analytics Tools - powerful full featured analytics tool. Even allows you to track your ROI by keyword for each AdWords ad position. Google AdWords also has internal split testing and conversion tracking software.
Google Webmaster Central - Leverage Google's Developer Tools Learn how to use Google API's and developer tools to put technologies like Google Maps and AJAX Search on your website.
Check GoogleT page ranking - Check your search engine placement and page ranking in GoogleT .A free search engine optimization tool.