When I graduated from high school, the theme of my diploma was “the Study of nonlinear dynamical systems with complex behavior”.
I wrote a C program for MS-DOS. It calculated ODE by the entered formulas, outputs a phase portrait of the system, the graphics component, their spectra, Lyapunov exponent, etc. I have used this program to study some nonlinear systems. And the first one was the Lorenz system.
It is time to create a new version based on new technologies 🙂