From the readme file at github:
PostgreSQL Database Modeler, or simply, pgModeler is an open source tool for modeling databases that merges the classical concepts of entity-relationship diagrams with specific features that only PostgreSQL implements. The pgModeler translates the models created by the user to SQL code and apply them onto database clusters from version 8.0 to 9.1.
Other modeling tools you have or are likely to encounter writing topic maps?
When the output of diverse modeling tools or diverse output from the same modeling tool needs semantic reconciliation, I would turn to topic maps.
I first saw this at DZone.