Chemistry puzzle game about lining up molecules correctly by placing certain tiles around a factory. Built by NoNotCar.
Blog
Bicycle
Long blog post about the physics behind bicycles. Full of interactives, and very cleanly done. Covers an absurd amount of mechanics. Created by Bartosz Ciechanowski.
Airfoil
A long interactive blog post about how a wing works, simulating the movement of air and pressure. The post gets into lots of related physics along the way.
A Free Particle Interactives
A set of Desmos simulations covering a wide range of physics including many about mechanics – an excellent resource for teachers and students. Created by Michael Freeman.
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.
Entropy Explained, With Sheep
Blog post about Entropy, full of interactive simulations. Written clearly and understandably, also with sheep. Created by Aatish Bhatia.
Clim’ City
Sim city style game about climate change. Currently only available in French, and also quite a bit out of date. But I love it. Created by Cap Sciences.