MATLAB seems to be the software of choice in applied math and engineering departments that I know of. It is a very well-documented software, and so learning how to utilize it, whether it'd be for visualizing data or modeling differential equations, is extremely easy.
But what typically happens for people leaving school and transitioning into industry? Is MATLAB used in industry at all, or is it more of an Academia thing? One thing I've noticed is the enormous cost of purchasing MATLAB for personal / non-student usage. It's like 3 or 4 thousand dollars for a license. In comparison, a student license costed me $20 for a year.