Oracle just announced the Early Adopter release of SQL Developer Data Modeler. You can download it from here: http://www.oracle.com/technetwork/developer-tools/datamodeler/overview/index.html
In case you missed it, Oracle is now offering SQL Developer Data Modeler for free, which is a tremendous savings from the original price tag and great for the database developer community.
As an added bonus, this release actually comes with an actual icon that when double-clicked, launches the application. A far cry from having to hand-code your own script. :)