A little rolling marble game where you’re a nucleus slowly fusing and radioactively decaying as you march through the periodic table. Fair warning, in Portuguese, but not too many words. Created by Priscila Caimi.
Category: Particle Physics
Quantum 3 Game
Game for iPhone (Android version not working) where you basically play a match-3, but with quarks forming hadrons. Created by Michigan State University.
Particle Simulator
Fascinating simulator that gives you a lot of power to change the rules of the world, adding in various forces, rules, and objects. Can create some interesting things. Built by lisyarus.
SWC Physics Simulations
Collection of physics simulations, with many interactive graphs, created by H. K. Wilfred Lee.
States of Matter
Investigating molecules bouncing around in a piston in various states of matter. Good thermodynamics simulations by PhET.
QUARKED! Adventures in the Subatomic Realm!
A full multimedia quark adventure, with videos, stories, and games. Created by a team led by Alice Bean.
Physics Simulations
Lots – hundreds at least – of small physics applets, around a wide range of topics, separated out into two semesters of college physics. Motion, thermo, EM, waves, and optics all covered. Created by Andrew Duffy.
Interactive Molecular Dynamics
Particle simulation that is great for exploring thermodynamics, or Newtonian mechanics, gas laws, etc. Created by Dan Schroeder.
Fowler’s Physics Applets
Collection of small physics simulations, many including nice explanations. Built by Michael Fowler.
JavaLab
Just an amazing trove of science simulations built by middle school teacher, DJ Lee. I’m amazed at how much is covered here.