Ever tried to explain physics to your child and make it interesting? Phun, writted by a Swedish graduate student, is a free cross-platform (Windows/Mac/Linux) physics simulator and is great way for kids to understand how things work in the physical world.
Explore concepts like friction, elasticity and wind resistace in a very interactive way. You can set up fluid simulations, knock down a house of cards, line up a trail of dominos - the options are endless.
It's so hard to find good software for kids, so we'd love to hear your favourites.