Google Webmaster Tools
With Google being the most used search engine, they love it when websites make use of their own products, and many of them are free to use.
By using these tools correctly, not only can you increase your presence on search engines, but also gain an insight as to how potential clients are using your website.
Ever wondered why your business is not showing up on search engine maps where your competition is visible, why some companies have a large box on the right hand side of the search results advertising there business. These are all free featured offered by Google.
Other tools include adding sitemaps that will help Google index your website correctly, placing your business on Google Maps and Google Analytics to help you discover the number of visitors to your website and how they interact with your website pages.