I was going to ask if maxima (a symbolic computation system) can be implemented in the browser, but it was answered four months ago [1]
[1] https://news.ycombinator.com/item?id=42853528
Do you use maxima? Would you say it's still worth using and learning?
It depends of what you need, but for example for calculus is a nice program. There is also sympy and Wolfram Mathematica. For symbolic computation I think that Mathematica is the strongest then maxima and then sympy, but sympy is based on python and I think it will get stronger. If you need numerical computation then there is octave or matlab or julia.