This web site contains a collection of interactive java simulations for physics. Each simulation includes a detailed explanation of the physics and math behind the system, as well as the numerical methods used to simulate the motion. Most are demonstrations of oscillators, but there are also games related to basic principles of force. Included are the double pendulum, simple pendulum, simple spring, molecular vibration and a chaotic pendulum. The page also links to movies relating to fluid-dynamics and reaction-diffusion.