Other sites to look at:

Arvind Gupta Toys
https://www.arvindguptatoys.com/k-v-potdar.php 

Brilliant Labs(Canada)
https://www.brilliantlabs.ca/

Crash Course Kids(YouTube)

https://www.youtube.com/c/crashcoursekids

Design Squad Global(PBS)

https://pbskids.org/designsquad/

Dyson Engineering Challenge Cards
https://www.jamesdysonfoundation.co.uk/resources/other-engineering-resources/challenge-cards/ 

Exploratorium:

• Watch and Do Science
  https://www.exploratorium.edu/education/ifi/watch-and-do

• Science Snacks
  https://www.exploratorium.edu/snacks
  
  

• The Tinkering Studio
  https://www.exploratorium.edu/tinkering/projects 

Frugal Fun for Boys and Girls-STEM Activities
https://frugalfun4boys.com/learn/stemactivities/

Kiddie Academy- 10 At-Home STEM Challenges
https://kiddieacademy.com/blog/family-activities/10-stem-activities-you-can-do-at-home/

Little Bins for Little Hands-STEM Challenges at Home
https://littlebinsforlittlehands.com/easy-simple-stem-activities-challenges/

Playful Engineering(Tufts)
https://sites.tufts.edu/pebl/resources/

• Lesson Plans https://sites.tufts.edu/ceeok8book/lesson-plans/

• Constructopedia https://sites.tufts.edu/pebl/resources/constructopedia/

Science Buddies
https://www.sciencebuddies.org/stem-activities

STEM at Home Activities(UK)
https://thestemhub.org.uk/stem-at-home/

Teach Engineering

https://www.teachengineering.org/

The STEM Laboratory
https://thestemlaboratory.com/stem-activities-for-kids/

PreK-2:

Seeds of STEM(PreK-2)
https://www.seedsofstem.org/

Coding/Computer Science

    Code.org
    https://code.org/ 

    Day of AI(MIT)
    https://dayofai.org/families/

    Scratch
    https://scratch.mit.edu/

    ScratchJr
    Coding with Scratch Jr.

Structures https://westonk12engineering.org/structures/index.htm

Woodworking  https://westonk12engineering.org/woodworking/index.htm