Moz Link Explorer (previously Open Site Explorer OSE) shows you all (or many) of the incoming links your site, or your competitor’s site. It now boasts one of the most comprehensive index of links, and a highly recommended tool for backlink research and analysis.
What we like: You can find areas to improve by researching your competitors’ backlink profile, and compare links you are missing that your competitors have acquired by using the “Link Intersect” tool for gap analysis. You can also uncover potential issues due to spammy links to your site.