After seeing yet another large OSS project encountering a giant tarpit of debate, I've thrown together a minimal CoC for ngscopeclient.
It's intentionally very basic to avoid being unreasonably restrictive; additional rules will be added if/when problems arise that dictate they be created.
Open to suggestions on phrasing and clarifications, but these rules are fundamental enough that their basic core is non-negotiable.
https://github.com/ngscopeclient/scopehal-apps/blob/master/CODE_OF_CONDUCT.md
Re usage of nice: some people perceive nice and kind as having very different meanings ("act according to social expectations" vs "act with care for others") and those people will likely at least slightly misread what you mean.
Re other atypical examples: I'm not suggesting you use something with the same meaning, but https://github.com/GlasgowEmbedded/glasgow/blob/main/CODE_OF_CONDUCT.md by @whitequark might be an interesting example of (a) what fits into CoC (b) a viewpoint.
