Another coding project to share today: an online interactive for demonstrating the areas under a curve for a Riemann sum.
I started work on this a couple of months ago, then forgot about it. I'm probably not teaching Calculus in the near future, so I lost some of my enthusiasm for completing all the ideas for this project. But given the work I'd already put into it, I thought it would be worth sharing what I've got anyway.
You can find it here: http://www.primefactorisation.com/areaapprox/
I might come back to this at some point. Let me know if you've got any suggestions, or any functions you'd really like me to add to it.