DDD is a graphical front-end for command-line debuggers such as GDB,
DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, the bash debugger,
or the Python debugger. DDD displays data structures as graphs and plots.
It installed all right on my Mac Pro, but wouldn't start up. I checked the Macports bug tracker and that bug (a fairly major one) is already listed. So I give it 1 star for effort, and one more because it probably would have been good if I could have got it running, but you really need to update your code, people.