The best free alternative to Mathematica is R (programming language), which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Mathematica and loads of them are free so hopefully you can find a suitable replacement. Other interesting free alternatives to Mathematica are Jupyter, SageMath, GNU Octave and Julia.
Calcpad is a lightweight mathematical platform for cloud and desktop. It parses simple text scripts and converts them into professional Html reports. Supports complex numbers, variables, functions, graphing, units and numerical methods.
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Mathics is a general purpose computer algebra system (CAS) and designed to be a free, light-weight alternative to Mathematica. It's programmable using a Mathematica like language and uses a web interface for user interaction.
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Free online apps bundle from GeoGebra: get graphing, geometry, algebra, 3D, statistics, probability, all in one tool!
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Altair Compose is used to perform a variety of math & linear algebra (including matrix analysis and differential equations), filter signals, fit polynomials through data, approximate or check results from simulation software, perform optimization.
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Python(x,y) is a free scientific and engineering development software for numerical computations, data analysis and data visualization based on Python programming language, Qt graphical user interfaces and .
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Axiom is a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
With Euler Math Toolbox, you experience mathematical computations, numerical as well as symbolic, with ease and beauty.
GiNaC is a C++ library. It is designed to allow the creation of integrated systems that embed symbolic manipulations together with more established areas of computer science (like computation- intense numeric applications, graphical interfaces, etc.) under one roof.
