I like calc paired with gnuplot. https://github.com/lcn2/calc https://github.com/lcn2/calc inb4 dc(1)/bc(1)... calc supports complex numbers, C-like pseudo st

I like calc paired with gnuplot. https://github.com/lcn2/calc https://github.com/lcn2/calc inb4 dc(1)/bc(1)... calc supports complex numbers, C-like pseudo structures/functions, custom decimal points and lots more. Also, calc/gnuplot will run on a toaster or even legacy systems from 20-25 years ago.