A port of the Eigenmath symbolic math engine to the fx-CG 10 / 20 calculators.
I built all of the UI, which is a console with many bells and whistles to make it usable on the calculator’s keyboard and screen. I also had to dive in the internals of the engine to fix some bugs, optimize the memory usage and implement expression pretty-printing and function graphing (it’s a graphic calc, after all!).
If you don’t have a fx-CG 10⁄20, you can still take a look at the pictures in the manual to see what it is about.