What is PhET Simulations?

PhET is a program developed at Colorado University with teachers and the classroom in mind. The program is completely free and contains hundreds of simulations around STEAM concepts from chemistry, math, engineering, etc. The simulations are designed to be open-ended and explorative, allowing students to critically think through different problems in their own time. Students can also come back to these simulations at any time to practice or review the concepts. Many of them also have supporting material and other teachers who provide lesson plans and other materials for each simulation.