This is a backlink checker tool, but you can get a full backlink analysis together with an anchor text analysis of your site if your registration for a free account is completed. This tool has many details on all the backlinks to your website and you can see how the links to your website increase or decrease. After the Penguin update, this will be a lifesaving tool for your site if your negative SEO is reached as you can receive all the link details and a percentage breakdown in the anchor text to your site.