Guys, backlink checking is a highly needed feature, but there are very few places that offer it for free, or at least that’s what I think. I thought we could share the sites or apps that can do this here.
Let me write down a few, and the experts can add the rest.
http://moz.com/
https://majestic.com/
https://ahrefs.com/
Google search results when used well 
My friends shared this before, but let me share it anyway
http://openlinkprofiler.org/