I stumbled across this surprisingly delightful source of games and educational tools while trying to explain analog clocks to my son. I'm impressed by the simplicity of the design and lack of login or advertising.<p>On the tech side, looks like the creator uses Javascript to create HTML5 canvas elements with: <a href="https://createjs.com/easeljs" rel="nofollow noreferrer">https://createjs.com/easeljs</a>