Software
Link Popularity Analysis(LPA) - http://www.link-popularity-analysis.com/
Provides detailed report, including which site link to your site, which link has high PageRank, which link with anchor text contains your target keywords.
Internet Corporation for Assigned Names and Numbers (ICANN) - http://www.icann.org/
A not-for-profit public-benefit corporation with participants from all over the world dedicated to keeping the Internet secure, stable and interoperable. It promotes competition and develops policy on the Internet’s unique identifiers.