First of all, mention may be made of Google Analytics that offers world class enterprise grade analytics entirely free of charge. It is a recommended install for every kind of websites seeking analytics program. Bing Webmaster applications and the Google Webmaster are arguably the best seo tools that help in communicating with Google. For keyword research in SEO, Google Adwords Keyword Tool is one of the software that is commonly used. Also, Google Trends is just another added tool that helps in checking query volume.