A few toys:

- Mandelbrot explorer
- Sierpinski triangles
- Animated sieve of Eratosthenes
- Approximating π
- Computing logarithms using Feynman's algorithm

Math games from the Zürich *Tages-Anzeiger*.

More are available on Github.

A manifesto on the teaching of math, translated by me into French from the Italian original by Riccardo Giannatrapani.