To run any of these Java applets, you will need to install
the latest version of the Java Runtime Environment on your
computer. You can download Java from Sun Microsystems for free.
All of these Java applets were created using GeoGebra, which is a multi-platform dynamic mathematics
software for schools that joins geometry, algebra and calculus. You can
download GeoGebra for free, and the
installation does not require administrative user rights.