graphiz

Graphical interface for Graphiz for Mac OS?

I installed the Graphviz GUI from pizelmap.com, but it appears to only be a viewer for .dot Graphviz files. I am looking for a graphical editor, where I can create diagrams by pointing and clicking--just like the iPhone app Instaviz. I would rather not code graphs by hand. Does anyone know of anything--preferably free? ...

PHP Application Flow Graph (or function call graph)

Happens that I've ended up working on a big PHP program and I need a program (or easy to install script) which draws a flow control/call graph of a PHP application (ie; must work over multiple PHP files). Already saw stuff like Graphviz, not sure which one works for PHP? Any suggestions? Cheers! ...