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Free software. Open source is less important. We're GNU. :-)

I'd rather pay for matlab out of pocket than have to use octave.

My general opinion has settled on:

Doing linear algebra -> Matlab/octave

Twiddling data tables around and making plots -> R

Doing linear algebra -> Julia

twiddling data tables making plots -> python/numpy/matplotlib

abstract math/calculus -> python/sympy

statistics/quick data analysis -> R