PhET Simulations
All PhET original simulations or custom modifications are by PhET Interactive Simulations, University of Colorado Boulder. Licensed under CC-BY-4.0 (https://phet.colorado.edu/)
Kirby Simulations
All Kirby simulations or custom modifications are by Martin Kirby. Licensed under CC-BY-4.0 (https://sites.google.com/a/kirbyx.com/waveadd)
Image Credits
“Oscillations and Waves” figure: image credit