The standard Munin Graph use RRD GRaph to display the objects to the user.
Install the Debian/Ubuntu package or download the source code. That's it ! The Web server must have PHP activated, and run on the Munin server. All the details are on the Installation page.
All the source code is free and open. The licence is a BSD licence.
The SVN repository is available
The mailling-lists will be available soon.
Use the contact form until they are active