NASA Space Place is a website for kids with fun facts, videos, games, and crafts about Earth, space, and STEM.
National Geographic Kids website full of games, fun activities, cool articles, videos, and awesome experiments.
https://kids.nationalgeographic.com/
Dav Pilkey famous author of Captain Underpants, Dog Man, Mighty Robot and many more. His website has upcoming books, fun games, and videos.
Who does not love Brain Pop? If you did not know Brain Pop is a series of animated educational videos for kids on various topics including: science, social studies, math, art, music, health, and technology. You can log in using CLEVER.
DC Kids is a DC Comics website with fun DC Kids-related games, videos, and downloads.
Let your budding architect build a city or neighborhood out of paper. Foster + Partners Architectural Design and Engineering Firm, have provided free templates for kids and kids-at-heart adults to build cities, neighborhoods, skyscrapers, and even trees out of paper. This is a fun family project.
https://www.fosterandpartners.com/news/create-your-own-city-architecturefromhome
Prodigy gives your child an opportunity to learn, practice, and play math games that are challenging and fun. Sign up for a free account that will send you a progress report of how your child is doing.
(Experiment Library)
Check out Steve Spangler Science's website: Experiment Library. This library is full of ideas for fun experiments that can be done at home for free under parental supervision.
https://www.stevespanglerscience.com/lab/experiment-library/
This website contains highly interactive simulations in physics, biology, chemistry, earth science, and math created by the University of Colorado Boulder. The simulations discuss many topics including sound, color, motion, genetics, waves, arithmetic, fractions, electricity, light, and many more. The simulations are leveled for elementary, middle, high school, and college. These topics are of higher-order level and thinking, but would be a great introduction to a budding junior scientist.