flock
Flock is a simple tool to create visual object graphs of Swift source code.
To create the above diagram using Graphviz:
$ cd <flock repo>
$ flock Source > object_graph.dot
$ dot -Tpng object_graph.dot -o flock.pngInstallation
$ brew tap naoty/misc
$ brew install flockUsage
$ flock [folder of swift files] > object_graph.dot
$ dot -Tpdf object_graph.dot -o object_graph.pdf