Such a fun story included here. It'd be great if this was also in a native web-app ebook too (i know it's harder to charge $ effectively, but most people end up wanting the physical or epub (for their e-reader) anyway if they like it.
One which I usually bring up is:
https://mathcs.clarku.edu/~djoyce/java/elements/elements.htm...
but contrast that with:
https://apps.apple.com/us/app/the-elements-by-theodore-gray/...