OpenSiteExplorer.org is a tool that lets you analyze your backlinks
OpenSiteExplorer.org is a tool developed by SEOmoz.org aimed at analyzing the popularity and backlinks for any webpage. While the website offers a range of useful resources to its visitors for free, the Pro version can offer Seo professionals additional tools to help them with their research and day-to-day tasks.
Open Site Explorer and Linkscape
Open Site Explorer is powered by Linkscape, SEOmoz.com's web index. It is similar to any major search engine in the way it crawls the Internet. The index now contains a rich repository of trillions of links and millions of root domains making Open Site Explorer's link data highly comprehensive and reliable. Open Site Explorer's link data, metrics and analysis can be used in a variety of ways including backlink analysis for your website, finding out if there are any problems with links pointing to your website as well as analyzing the online marketing efforts of your competitors. For some more ideas on how Open Site Explorer can be useful for your website, please visit this page.