Casio fx-7500g is a nice programmable pocket calculator. I wrote some programs on it during the most boring lessons of secondary school and University; some programs may be useful, some clearly NOT. Here they are:

Games and drawings

Mandelbrot fractal plotter, 1.0: it will take a life (=some hours) to plot the complete Mandelbrot fractal with this program, but the final result is amazing.

Gingerbreadman fractal plotter, 1.0: another fractal. Formula is easier than Mandelbrot's, so plotting is much faster.

Spirographic plotter, 1.0: a simple demo to draw spirographic curves.

Shooting game, 1.0: a small artillery shooting game on your calculator, very useful if today's lessons are deadly boring.

Scientific applications

Linsys, 1.0: solves a linear system of N variables.

DFA simulator, 1.0: simulates a Deterministic Finite Automaton, a true/false decisor based on a symbol/state table.

Integral, 1.0: numerically solves the finite integral of a given function.

Routh, 1.0: calculates the Routh table of a given dynamic system polinomial.

Fraction, 1.0: helps to do simple operations with fractions, including simplification.