SpecGen4 is a tool for generating specifications for Semantic Web based on ontology namespace definitions in RDFS and OWL. It can be found at: http://sw.deri.org/svn/sw/2005/08/sioc/ontology/spec/specgen4.py
It is written in Python, based on original SpecGen developed by Christopher Schmidt and uses Redland RDF library by Dave Beckett. There is also a new branch of SpecGen with many improvements, and probably we'll integrate it in our version.
Example specification: http://rdfs.org/sioc/spec/