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There's no single SEO tool that will get a web site to the top of the rankings. A search engine optimization specialist needs to use several tools and techniques in unison to boost page ranks most effectively. These are a few free tools we use to gather information on the sites we optimize.
Google Webmaster Tools (Website)
Google is the top search engine and SEO practices that get good rankings there will get you good rankings everywhere else. Google provides webmasters access to see exactly what their search engine spider (known as googlebot) sees when it accesses the Webmaster's web site. This precious information allows the Webmaster to tweak the web site's content in order tomaximize keyword exposure. In other words, it aids in optimizing the site's markup for search engine compatibility and keyword targeting.
Google Analytics (Website)
This tool tracks information on the visitors of a web site. A simple script is placed on each page and information about every visitor is tracked and stored to your Google account for you to review over time. You can use this with Webmaster Tools to track how keyword manipulation affects hit counts.
Alexa (Website)
Alexa is a valuable resource to keep tabs on how your competitor's web site ranks. There is a wealth of information obtainable from this web site without having to add scripts or files to the target site to prove ownership. This enables our search engine optimizers to be one step ahead of your competitors, ensuring page rank and search query dominance.
Firefox SEO Tools (Firefox Plug-in)
This Mozilla Firefox plug-in enables extra information to be attached to the bottom of search results for Google and Yahoo. We use this information to quickly gauge keyword trends and adapt sites' keyword campaigns accordingly.
XML-Sitemaps.com (PHP Script)
This is a great script to quickly and easily create xml-based sitemaps to submit to all of the major search engines. Submitting sitemaps is a wise practice as it ensures that search engine crawlers index every page of your site. It even generates html-based sitemaps to put right on your site. It comes as a free version for smaller sites and as an unlimited version for sites with hundreds of pages.