Entity Relationship Editor written by Gert Helsen for the ADREM group of the University of Antwerp.
It is simple and appear to work (haven't tested it extensively). To run it, just use java -jar EREditor.jar (I tested it with Java 8u101). The editing of entities/objects is not intuitive, I tried to double click on an entity name to change it and it just added two entities. To rename an entity you have to select it and then change the name attribute on a right hand side pane.
Can't get it to work at all, and there doesn't appear to be any documentation, help or support.
This project has been used for years within basic and advanced database courses at the University of Antwerp. It's one of the better standalone, lightweight and easy-to-use drawing tools for ER models.