Java based and open sourced version of matlab and octave
Getting more and more compatible over time.
Platforms
- Android

Apps similar to Mathematica include R (programming language), which is free and open source. Other options are Jupyter, SageMath, MATLAB and GNU Octave. Calculators like Mathematica are a crowded field, with more than 50 alternatives for Windows, Linux, Mac, the web and Android.
Java based and open sourced version of matlab and octave
Getting more and more compatible over time.

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