Analyze backlinks from unique domains in an instant on MajesticSEO.com. They also feature a free bad-neighborhood checker which checks the backlinks on other domains hosted on the same server and a bulk backlink checker. Tools worked very well and quickly. The site also offers a pro version with which you

View, classify, and download comprehensive data about internal and external links to your site with Google’s WebmasterTools. You can also see how visitors get to your site.   Related posts: Link Popularity Checker Analyze Backlinks Instantly External Link WordPress Plugin