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
Blackbody Spectrum	Build an Atom	Buoyancy
Calculus Grapher	Capacitor Lab: Basics	Charges And Fields
Circuit Construction Kit: DC	Circuit Construction Kit: DC - Virtual Lab	Collision Lab
Color Vision	Concentration	Curve Fitting
Density	Energy Skate Park: Basics	Equation Grapher
Estimation	Expression Exchange	Faraday's Law
Forces and Motion: Basics	Fraction Matcher	Friction
Function Builder	Function Builder: Basics	Gene Expression Essentials
Geometric Optics	Graphing Lines	Graphing Slope-Intercept
Gravity And Orbits	Gravity Force Lab	Hooke's Law
Isotopes and Atomic Mass	John Travoltage	Least-Squares Regression
Lunar Lander	Make a Ten	Masses & Springs
Molarity	Molecule Polarity	Molecules and Light
Molecule Shapes	Molecule Shapes: Basics	My Solar System
Neuron	Normal Modes	Ohm's Law
Pendulum Lab	pH Scale	pH Scale: Basics
Plinko Probability	Projectile Motion	Proportion Playground
Radiating Charge	Reactants, Products and Leftovers	Resistance in a Wire
Resonance	Rutherford Scattering	States of Matter
States of Matter: Basics	Stern-Gerlach Experiment	Trig Tour
Under Pressure	Unit Rates	Vector Addition
Wave on a String

All the HTML5 sims

in an app!