SageMath: SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.
Mathematics
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This looks like a great resource for catching up on any math topic – neat! (via Ton Zijlstra)