All simulations available at http://phet.colorado.edu are open educational resources available under the Creative Commons Attribution license (CC-BY).
Permission is granted to freely use, share, or redistribute PhET sims under the CC-BY license.
PhET Interactive Simulations
University of Colorado Boulder
Using PhET Interactive Simulations in Lecture. A two-page overview of uses of PhET simulations in lecture settings.
View teacher-contributed demonstrations and activities at our Activity Database.
How do I increase student interactivity when using PhET sims in lecture? Tips on facilitating student discussions, peer instruction, and interactive lecture demonstrations with PhET simulations.