Every project that uses the webMethods Integration Server has the problem to document the code. The webMethods Developer has a function to generate HTML documentation for a single flow.
That looks nice but when you need to generate documentation for a whole package then this is obviously not the best choice.

Software AG provides a nice package called WmDoc in the samples area. This allows to make the documentation browsable with a webbrowser. The nice thing is that your documentation is never outdated as it is automatically regenerated when you browse to a service.

You find it the package here (Advantage account needed): http://advantage.webmethods.com/article/?id=1612707169.