I've got a new page on my website titled "Home Fun For Kids". Right now it's got a few things listed that my kids love, but I'm planning on adding more things in the future. These are all free activities, though some (like prodigy) have and optional paid service. Please let me know of any resources you know. If it's a website of resources I'll post it if it doesn't overlap too much with the resources I already have. The page is: https://www.daniduck.com/home-fun-for-kids/
These are the current links I have posted, but will be adding more soon to the link above!
Coding: Scratch Jr. https://www.scratchjr.org/ Works on both Android and Apple Devices. There is also a version of the program for older kids and adults called Scratch: https://scratch.mit.edu/ (This program is used at my child's school).
Math Fun: Prodigy https://www.prodigygame.com/ You can play in a browser or on a tablet/phone. Your child may have a profile through their school. (This program is used at my child's school).
Roblox: Contains a lot of player created games. https://www.roblox.com/ Roblox Studio (for creating games): https://en.help.roblox.com/hc/en-us/articles/203313860-Roblox-Studio