Responsive design for code formatting! From the refmt docs, demonstrating its flexibility:
miniblog.
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earlyoom is a neat linux tool that kills processes a little earlier, so your system remains responsive: https://github.com/rfjakob/earlyoom
The readme is pretty educational too, and even encourages you to `tail /dev/zero` to see it in action!
Writing a REPL that evaluates-as-you-type, keeping the UI responsive and staying defensive against runaway memory usage: https://scattered-thoughts.net/writing/making-live-repls-behave/
It's a really hard problem for PLs, but even this small live demo has a lot of complexity.
An excellent overview of the different gradient descent algorithms, and a nice example of content that is available as both a responsive website and a PDF on arXiv:
