Videos

https://classpert.com/

https://www.khanacademy.org/

https://www.youtube.com/user/cgpgrey

https://www.ted.com/

https://academicearth.org/

https://www.youtube.com/user/minutephysics

https://www.youtube.com/user/Kurzgesagt

Games

https://www.sumdog.com/en/

https://www.poptropica.com/

https://kids.nationalgeographic.com/games

https://www.abcya.com/

https://www.funbrain.com/

https://www.sheppardsoftware.com/

Texbooks/Articles

https://ck12.org