I've vibe coded a few things in C now as experiments, but I haven't been brave enough to put any of them into production code yet. I don't trust myself to review them properly.

C extensions for SQLite: https://simonwillison.net/2024/Mar/23/building-c-extensions-...

This one is closest to something I might use because it's C compiled to WebAssembly, so the blast radius for any dumb bugs is strictly limited: https://github.com/simonw/research/blob/main/cmarkgfm-in-pyo...