I made these plugins, I thought somebody else might want to use them as-is, fork them, etc. Both were tested with 0.9.x. Neither are configurable via ACP so I didn't publish to NPM, but wanted to share anyway:
Profanity filter:
https://github.com/fenwick67/nodebb-plugin-profanity-filter
Filters out profanity in posts and post titles. Also supports custom word list via environment variable PROFANITY_FILTER.
Email Domain Filter:
https://github.com/fenwick67/nodebb-plugin-email-domain-filter
Set env var
[email protected] and only let people with an @club.org email address sign up.