MATLAB
MATLAB is a very high level programming environment. I developed my love for MATLAB about the time I was a Junior at UW when I really took ahold of programming in general and built myself some great tools for use. Where most of these tools are now? I have no idea, but I will probably upload them as I come across them on my hard drives from time to time. What MATLAB has going for it is the whole package from equation solving, discrete mathematics, Fast Fourier Transform (FFT), plotting package, file handling, and the user based accessible code. The language is really easy to pick up and implement which is why many engineers use it instead of other languages. However, MATLAB does have it shortcomings, the major one be the execution speed. MathWorks has tried to combat this several ways, but many times in the end it's just best to use a more powerful language like Fortran or C/C++ even starting to lean towards Python.