HN discussion of interesting technology demos for fifth graders: https://news.ycombinator.com/item?id=20069714
One popular suggestion was browser tools, showing how web sites can be modified.
Another great idea is showing screenshots of bugs in realistic games and how they can go wrong.
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I've been experimenting with LLM autoresearch. I prompted Sol to make difftastic faster without changing output on the test suite, and log everything it tried:
https://github.com/Wilfred/difftastic/blob/c6e9c6fed4c71276a8b0e377c92695c3d929dc7f/PERF_RESEARCH_LOG.md
It found some interesting performance tweaks, although it's too tolerant of complexity.
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Compiler error messages is such a deep topic. Even in rustc, a mature compiler that invests effort in diagnostic quality, I find interesting issues every few months.
(The majority have been fixed pretty quickly, so it's really rewarding to file issues.)
nREPL is a really interesting protocol for developer tools. It's extensible, but one of the basic operations is eval().
If your nREPL server doesn't support a given operation, you can just send an eval request to achieve the same result!