brew-graph is a Ruby script that creates a dependency graph of installed or all available Homebrew formulae. The currently supported output options are Dot and GraphML.
You can install brew-graph using the tap repository:
brew install martido/brew-graph/brew-graph
Alternatively, simply place brew-graph.rb somewhere in your $PATH as brew-graph.
If you installed using the above instructions, you can simply execute brew graph -h to see options.
If within this repository directory, type ruby brew-graph.rb -h to display the options.
You can use Graphviz to visualize Dot graphs.
brew install graphviz
brew graph --installed | dot -Tpng -ograph.png
open graph.png
You can use the yEd graph editor to visualize GraphML markup. The created markup uses yFiles's extensions to GraphML and heavily relies on defaults to keep the output reasonably small. It contains no layout information because yEd already provides an exhaustive set of algorithms.