I was doing some research for a resource visit last week, and I came across this great resource from the University of Colorado Boulder. It is called PhET and it provides free interactive math and science simulations.
The simulations are written in Java, Flash or HTML5, and can be run online or downloaded to your computer. All simulations are open source and are free to all students and teachers. They are great to show on your interactive board.
Here’s a short video introduction to the PhET simulations: