https://interactives.ck12.org/simulations/physics.html
http://physics.bu.edu/~duffy/HTML5/index.html
http://www.csun.edu/science/software/simulations/physics.html
http://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/home.html
https://www.olabs.edu.in/?pg=topMenu&id=40
https://phet.colorado.edu/en/simulations/category/physics