Branalyzer is an interesting tool with some great data for backlink research and much more. I've had it for a while but just upgraded to the Enterprise level so I could export results which I feel is a very strong benefit.

The roadmap is VERY exciting, especially the Affiliate Research, Table Filters, and Exact Backlink URLs that are coming! I'd like to see sub-users where I could have an assistant do research for me without sharing a login.