TCM

"The Toolkit for Conceptual Modeling (TCM) is a collection of graphical editorsfor different software specification methods. It contains generic editors (forgeneric diagrams, tables and trees), editors for Structured Analysis(entity-relationship diagrams, data and event flow diagrams, state-transitiondiagrams, function refinement trees etc.) and editors for UML (static-structurediagrams, use-case diagrams, activity diagrams etc.). TCM supports variouslevels of constraint checking for single documents. Features to be added laterinclude constraint checking across documents and executable models, and supportfor hierarchic graphs. In addition to the TCM file format, TCM outputs PlainPostScript, Encapsulated PostScript, PNG and the XFig file format. The TCM fileformat is simple to read and parse so other forms of output can be generatedeasily." (Description on Freshmeat)