as in the subject,

is there any way to visualize, sort of a mind mapping way, roundcube source code?
for somebody who would like to participate, help with the development, but who is only
an entrant to this whole web development thing, having such a possibility
would be a massive help I am sure for everybody like myself.
does this concept even work for php?
what is there in the docs is obviously for a dev whizz, right?

cheers