Was browsing GitHub for HA custom components and stumbled on Indeklima by kingpainter.
What it does: Takes your existing temp/humidity/CO2/pressure sensors and turns raw numbers into actionable stuff — severity scores per room, mold risk estimates, ventilation recommendations, even tells you whether to run the dehumidifier. All through a sidebar panel and Lovelace cards. HA Gold Tier quality scale, English + Danish.
The integration itself is solid. 7 releases, active development, proper test suite. But the README was... odd.
You land on the repo and the first thing you see is "Thank you for considering contributing to Indeklima! 
Fork the project, clone your fork, create a branch..." — the entire page is a contributing guide. No "what is this", no "how to install", no entity list.
What a new user actually needs:
Before (current README)
- Opens with: how to fork & clone
- Code standards & formatting
- Dev environment setup
- No entity list
- Contributing is the entire page
After (what I proposed)
- Opens with: what it does and why you want it
- Installation (HACS + manual)
- Configuration walkthrough
- Per-room and hub entities listed
- Contributing → links to CONTRIBUTING.md
Anyway — this got me thinking. There are a lot of really useful HA custom integrations out there with docs that assume you already know everything. If you maintain one and the README could use some love, drop a link. Happy to take a look. No catch, just like fixing messy docs.