For free, you can sign up to get the Google webmaster tools. It is very easy to sign up, and once signed up, you will add code to your website allowing Google to verify your site.

Once you have gone ahead and verified your website, you will then be able to see a multitude of stats and information in regards to your website. You will be able to see how often Google indexes your site - and you will be able to see which pages Google has indexed. You will also be able to get detailed information on how your page ranks in Google. You will be able to see both the keywords for which your website ranks for as well as the keywords which drive the most traffic to your website. This keyword data is very important, as it can give you an idea of which keywords to focus on. If you see that you are getting ranked for a valuable keyword, you can focus more on this keyword throughout your site and on your anchor links to try and boost your ranking for that respective keyword.

Google webmasters is an excellent resource, and its free. Getting indexed and ranking well on Google is critical to your efforts at getting free organic traffic. And by using this tool, you can help maximize your chances at getting this free organic traffic to your website.