PhET is a free resource that I’ve been recommending for many years. It now offers more than 100 math, physics, chemistry, and biology simulations that you can use in your classroom for free. About two years ago PhET started creating new simulation and editing existing ones to add accessibility features. Last week PhET released the latest simulation to include accessibility features. Now there are now 46 PhET simulations that include accessibility features.  

Quadrilaterals is the latest PhET simulation. With this simulation students can move the sides of quadrilaterals to see how that effects the shape. The simulation can also be used in lessons about classifying quadrilaterals. 

Like almost all PhET simulations this new one can be used online and offline. You can share it in Google Classroom or in your favorite LMS. The simulation can be embedded into a web page as I’ve done below.