University of Colorado

Free
Translate from symbolic to molecular representations of matter.
Free
Use an air hockey table to investigate simple collisions in 1D and 2D.
Free
Help identify whether a solution is an acid or base and strong or weak.
Free
Mystery is an easy-to-use scientific program where you can create an equation.
Free
Whit this scientific tool you can measure velocity and glacial budget
Free
This program enables you to explore pressure in the atmosphere and underwater
Free
Build circuits with resistors, light bulbs, batteries, and switches
Free
PhET is a collection of physics simulations from University of Colorado