PhET Interactive Simulations - Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.

LabsLand - LabsLand lets students access real educational laboratories through the Internet.

ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.

myPhysicsLab - myPhysicsLab provides JavaScript classes to build real-time interactive animated physics...

BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.

Cloudschool - The world's simplest Learning Management System.