Codex is a file-based documentation platform built on top of Laravel. It's completely customizable and dead simple to use to create beautiful documentation. Codex is able to do things like transforming markdown or automaticaly fetching documentation from a Bitbucket/Github repositories. Most of it's features are provided by addons.
As you know, Agile Manifesto claims "working software over comprehensive documentation". So you might get the impression that Agile methodology rejects all documentation. Then you are wrong. We will provide a brief overview of the best practices of Agile documentation. Yes, indeed static documentation is too rigid for Agile.