I've been impressed with code written by Fable in my testing:
Difftastic: found small optimisations in a hot loop I'd already profiled extensively. Helped me prototype Dijkstra to A* too (hard to find a good heuristic).
Garden: Found some real bugs in my simplistic typechecker.
I see people advocating for writing a FAQ, but I really struggle to write one from scratch.
The best FAQs are written as a response to, well, frequent questions.
How do you populate the initial FAQ?
I've written difftastic packaging instructions:
https://difftastic.wilfred.me.uk/packaging_difftastic.html
The different distros have taken different approaches, so I'm trying to help with common gotchas — don't forget the man page!
Feedback welcome, especially if you've ever packaged something 🙂