Chaos

The von Koch demonstration allows the user to build a von Koch curve and observe the length and area change. The curve is a fractal with a nonlinear dimension like many chaotic system. Go to von Koch curve.
The Lorenz demonstration solves the Lorenz equations, which can describe a chaotic system, for parameters set by the user. It also calculates Lyapunov exponents and dimensions. Go to Lorenz Solver.
The Kuramoto-Sivashinsky (KS) equation is a one-dimensionally spatially extended model that can exhibit spatiotemporal chaos under certain conditions. Go to KS Solver.
Source code.