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1. Maxima
A general purpose CAS (Computer Algebra System) is a program that’s able to perform symbolic manipulation for the resolution of common problems. [...]2. Scilab
Matlab is the standard for numerical computing, but there are a few clones and valid alternatives that are entirely free. Scilab is the closest that you can get to Matlab without spending a penny. [...]3. R
For statistical computing and analysis in the Open Source world, it doesn’t get any better than R. [...]
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