The best replacement for mathematica is matlab.

The best alternatives to mathematica are rated as following:
★★★★★  matlab
★★★★  maple
★★★  mathcad
★★  r
★  sage
★  wolfram alpha
★  maxima
★  wolfram language
  octave
  minitab
  lisp
  stata
  maplesoft
  mupad
  maple better

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Google Trends

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