Nikon BDC, Burris BallisticPlex and Leupold B&C.
As I read the list, many of the requests are for FFP scopes that have the ability to dial. Worst case, just dial! For those of us that have SFP scopes on hunting rifles, this holdover with something more than a duplex reticle is a godsend. Perhaps if you were to take the approach of determining what non-duplex SFP scopes are most popular and then work from there - you would be appealing to an audience that is not served by any other US based APP.
As a side note, giving users the ability to build their own reticle based on data often available about their own reticles, would be a very powerful alternative to licensing. We could establish a user community with technical information that could be shared on each reticle in a manner that could be readily incorporated into the APP. I think most people advanced enough to make proper use of AB could drop/transfer dimensional data of their favorite reticle into a "reticle builder" function within the app. Probably cheaper to design this than deal with all the scope manufacturers and ongoing maintenance of the licenses.