Portgraph: graphing FreeBSD ports dependencies:
Portgraph is a Python program that produces dot (graphviz) output. The output shows a minimal dependency tree of the selected port, based on information from /usr/ports/INDEX. I suspect this is most useful for decorative purposes, though people trying to figure out load-balancing on build clusters might find it useful as well.
I’m currently wrestling with a b*rked ports installation and found this in some search results. At the very bottom of the two graphic maps are the ports I keep stumbling over: libtool, expat, and gettext.