PhET Interactive Simulations

Acid-Base Solutions	Area Builder	Area Model Algebra
Area Model Decimals	Area Model Introduction	Area Model Multiplication
Arithmetic	Atomic Interactions	Balancing Act
Balancing Chemical Equations	Balloons and Static Electricity	Beer's Law Lab
Bending Light	Blackbody Spectrum	Build a Fraction
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	Coulomb's Law	Curve Fitting
Density	Diffusion	Energy Forms and Changes
Energy Skate Park: Basics	Equality Explorer	Equality Explorer: Basics
Equality Explorer: Two Variables	Estimation	Expression Exchange
Faraday's Law	Forces and Motion: Basics	Fraction Matcher
Fractions: Equality	Fractions: Intro	Fractions: Mixed Numbers
Friction	Function Builder	Function Builder: Basics
Gases Intro	Gas Properties	Gene Expression Essentials
Geometric Optics	Graphing Lines	Graphing Quadratics
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 and Springs	Masses and Springs: Basics	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 Interference
Wave on a String

All the HTML5 sims

in an app!