Ask HN: What do you use for developer documentation?

[nolite]

I'm working on a Rails project that is starting to get pretty large in scope, and would like to start producing some clear documentation for the newer developers who are joining the project. What are some of the tools that people use on their projects or companies that help you maintain clear and up to date documentation?

[tucaz]

What kind of documentation? Code documentation? Process documentation? Architecture documentation? Something else?

Anyway, I like the idea of a Wiki or something similar. Everyone can contribute to it, it's easy to setup and not much effort to put stuff inside it.

[nolite → tucaz]

Well, at the risk of asking too much... Any (All)of those things.. I'm just starting out as the tech lead of a project we're bootstraping, and this is one the the weak areas I find ourselves heading in. So i'd like improve every aspect of the documentatiton that I can