[ben336]

If by diagrams you mean charts, possibly https://jakevdp.github.io/blog/2012/10/07/xkcd-style-plots-i...

[frunzales]

This comes close enough but it's not the exact software that was posted around here :-)

[LeonB]

was it this? http://shaky.github.bushong.net/

[frunzales]

I believe so. It's very close to what I've previously seen posted here.