GlowScript is an easy-to-use, powerful environment for creating 3D animations and publishing them on the web. Here at glowscript.org, you can write and run GlowScript programs right in your browser, store them in the cloud for free, and easily share them with others
Source: GlowScript IDE
This one is for the most advanced students or teachers. I found it through the Wired article, Something’s Off With the Turbolaser Shots in The Last Jedi. The author used GlowScript to help get his point across by simulating the physics of the turbolaser shots.
Simulations created with GlowScript can be embedded on websites or you can share the url to the simulation on the site.