PhET Interactive Simulations

Acid-Base Solutions	Area Builder	Arithmetic
Atomic Interactions	Balancing Act	Balancing Chemical Equations
Balloons and Static Electricity	Beer's Law Lab	Bending Light
Build an Atom	Capacitor Lab: Basics	Charges And Fields
Circuit Construction Kit: DC	Circuit Construction Kit: DC - Virtual Lab	Color Vision
Concentration	Energy Skate Park: Basics	Expression Exchange
Faraday's Law	Forces and Motion: Basics	Fraction Matcher
Friction	Function Builder	Function Builder: Basics
Gene Expression Essentials	Graphing Lines	Graphing Slope-Intercept
Gravity And Orbits	Gravity Force Lab	Hooke's Law
Isotopes and Atomic Mass	John Travoltage	Least-Squares Regression
Make a Ten	Molarity	Molecule Polarity
Molecules and Light	Molecule Shapes	Molecule Shapes: Basics
Neuron	Ohm's Law	Pendulum Lab
pH Scale	pH Scale: Basics	Plinko Probability
Projectile Motion	Proportion Playground	Reactants, Products and Leftovers
Resistance in a Wire	Rutherford Scattering	States of Matter
States of Matter: Basics	Trig Tour	Under Pressure
Unit Rates	Wave on a String

All the HTML5 sims