Graph is a type of hash that outputs in graphviz's dot format. It comes with a command-line interface that is easily pluggable.
SVG:::Graph is a pure Ruby library for generating charts, which are a type of graph where the values of one axis are not scalar. SVG::Graph has a verry similar API to the Perl library SVG::TT::Graph, and the resulting charts also look the same. This isn't surprising, because SVG::Graph started as a loose port of SVG::TT::Graph, although the internal code no longer resembles the Perl original at all.
Creates a simple dependency graph of Homebrew formulae.
Import of GRATR (GRAph Theory in Ruby) (version 0.5.1; svn rev 38; 20080616) with some minor fixes for ruby 1.9.
Ruby implementation for a few graph algorithms
RGL is a framework for graph data structures and algorithms in Ruby.
Graph the dependencies of your repositories