https://www.cnet.com/how-to/distance-learning-online-education-classes-for-every-age-and-grade/

Login w/ free account. Requires Steam client.
https://store.steampowered.com/app/628950/Nephise_Begins/

Use code "GIFT."
https://www.cbs.com/all-access/?cbscidmt=picard&promo=gift&ftag=AAM-05-10aib5h?ftag=YHF4eb9d17

Source:
https://news.yahoo.com/free-month-cbs-access-during-075631546.html

Just say “Free” into your voice remote to see all options.

Login w/ free account. Requires Epic Games Launcher client.

https://www.epicgames.com/store/en-US/product/paladins/epic-free-bundle?sessionInvalidated=true

Base game:
https://www.epicgames.com/store/en-US/product/paladins/home

Reg. $2.99. Login w/ free account. Scroll down & click “Add to Library” to claim. Access library via same button once claimed or by human icon at upper right of page.

https://freebies.indiegala.com/rc-cars/

Available now

Steam version here
https://store.steampowered.com/app/1085660/Destiny_2/

Here are some Museum & Library coloring offerings (More suited for teens & adults)-Download & print:
http://library.nyam.org/colorourcollections/

Already posted but some may prefer the direct links above:
https://phatwalletforums.com/topic/22415/help-toddlers-beat-the-boredom-virtual-disney-rides-virtual-field-trips-youtube