Hi Philip, are you talking about the webGUI? Not yet, but I bet there will be a web server management system similar to m0n0wall soon enough. I ask if you refer to the m0n0wall webGUI because I am a big fan of it. I recently adjusted the webgui of the bookkeeping system (
http://www.pbooks.org/ )I'm working on to align with that of m0n0wall, but the accounting system uses XSL templates.
You mentioned ubuntu and that can easily have Apache Mysql and PHP in a server setting, but that is linux, not FreeBSD, like m0n0wall.
Of course, FreeBSD supports these software projects too, so you can install them onto a regular FreeBSD server.