UC Berkeley's Understanding Science: https://undsci.
PhET Simulations: https://phet.
Periodic Table Videos: http://www.
Annenberg Learner: https://www.learner.
Interactive Cell Model: https://www.cellsalive.
Simulation of Phases of the Moon: https://sepuplhs.org/
Simulation of the Water Cycle: https://www3.epa.gov/
Scientific Calculator: https://www.