Thanks. The only Mac-only competition I know of is Cartographica, which is $500 vs $40 for Magic Maps.
It's mostly Objective-C. The core map-projection library is C and OpenCL, which I had a lot of fun with! I open-sourced that library (ProjCL) a while back: https://github.com/evanmiller/ProjCL
It's mostly Objective-C. The core map-projection library is C and OpenCL, which I had a lot of fun with! I open-sourced that library (ProjCL) a while back: https://github.com/evanmiller/ProjCL