Maybe you loved math as a kid, maybe you hated it. Whatever the case, I'm sure something as neat as the MathWorld site would have made it more fun. I sure wish they had this type of website and software available when I was learning math.

You can get Kig for free. Kig is part of the KDE Edutainment Project.

The KDE Edutainment Project is developing high-quality educational software for the K Desktop Environment. The primary focus is on schoolchildren aged 3 to 18, and the specialized user interface needs of young users. However, they also have programs to aid teachers in planning lessons, and others that are of interest to university students and anyone else with a desire to learn!
Please see the online slideshow and learn about our software!