PhET is a service that offers totally free interactive mathematics and science simulations covering topics in physics, chemistry, biology, earth science, and mathematics. It has been popular with science and math instructors for several years. Recently, I discovered that PhET has actually been developing some simulations that provide online availability functions consisting of alternative inputs for navigation and interactive descriptions..

There are just nineteen accessibility enabled PhET simulations available at the minute and they are all still models. You can try them here..
PhETs complete library has nearly one hundred simulations. Those simulations can be included in PowerPoint presentations and ingrained into Google Sites..