I'd look at suggestions made by mamaar about projects with a lot of non-technical users.
I'd also look at projects where it is growing/big but the dev team is small enough that great documentation can sometimes be difficult for them to churn out.
> and would be happy to work with a reasonably non-technical person?
As long as you know how the system works and can explain things to users, that would already be a value-add to any project. If an OSS project can't appreciate your documentation, you simply walk away and contribute elsewhere.
Even on the internet, assholes and their projects eventually whither away if they can't appreciate any great contribution (granted, you must respect their processes and not become the asshole to their project).
I'd also look at projects where it is growing/big but the dev team is small enough that great documentation can sometimes be difficult for them to churn out.
> and would be happy to work with a reasonably non-technical person?
As long as you know how the system works and can explain things to users, that would already be a value-add to any project. If an OSS project can't appreciate your documentation, you simply walk away and contribute elsewhere.
Even on the internet, assholes and their projects eventually whither away if they can't appreciate any great contribution (granted, you must respect their processes and not become the asshole to their project).