nauty (no automorphisms, yes?) is a set of procedures for determining the automor- phism group of a vertex-coloured graph. It provides this information in the form of a set of generators, the size of the group, and the orbits of the group. It is also able to produce a canonically-labelled isomorph of the graph, to assist in isomorphism testing. This package provides the main command line tool dreadnaut, and some utilities ('gtools'). A C API is also available.
