George's
Math
Aid
for DCCC
Archimedes Leonhard Euler Carl Friedrich Gauss

SageMath
SageMath's mission is to offer a viable free open source alternative to Magma, Maple, Mathematica, and Matlab. SageMath is a mathematics software system that runs with other packages, such as JupyterLab, NumPy, SciPy, matplotlib, Sympy, Maxima, R, and more. Mathematics in SageMath is coded with the Python programming language.
"Why learn coding for math?" you ask. See the following videos.

SageMath
A computer algebra system.

CoCalc
An online computing environment for SageMath. Formerly SageMathCloud.

JupyterLab
A SageMath front-end for numerical simulation, data visualization, and more.

Python
Used in SageMath, a high-level general-purpose programming language emphasizing code readability.