SageMath

• SageMath can be used to study elementary and advanced, pure and applied mathematics. SageMath is a free open-source aviable on the gitHub 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. Access their combined power through a common, Python-based language or directly via interfaces or wrappers. A amazing handy video tutorial can be found here

Katex

• KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. Find KaTeX on GitHub

MatPlotLib

• Matplotlib is a comprehensive library for creating static, animated, and interactive visualizations