RMBench Relational Modeller is designed to be a one-stop Eclipse-integrated solution for grapically modelling relational databases. Databases can be reverse-engineered via JDBC, SQL can be generated from the model and executed directly from within the workbench.
RMBench has recently been released under EPL and is now free for any kind of use
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Submitted by Mark Leone on Sun, 2010-04-11 20:32
This tool does everything I need. It's very well conceived and executed, and quite easy to use. I actually started to use a different free tool I found, but went looking for an alternative when I saw that it didn't support Apache Derby. This tool supports Derby and all the other popular SQL dialects. The interface is far more intuitive and easy to use than the other tool I was using. Without reading any documentation, in an hour or so I was able to create DB connections, import models, create models and diagrams from scratch, and generate the SQL. You can create tables in the table editor, or import them from your DB instance, and then drag them onto diagrams to see a visual representation. You can generate SQL from any model element or the entire schema in just a few clicks.