DBDesigner 4 is a visual database design system that integrates database design, modeling, creation and maintenance into a single, seamless environment.
If you don’t already know about it, Dia is an open source diagram drawing application, similar to Microsoft’s Visio. It makes it really simple to create all sorts of diagrams, including UML diagrams, flowcharts, and network diagrams. It also allows diagrams to be exported to a number of formats, including PNG images
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It is a tool that allows you to create a database ERD in Dia (using the UML shape toolset), then to convert that ERD into a SQL DDL script for multiple databases. Traditionally, to be able to do these things, you've needed to have a Win32 OS installed. But because Dia is available for Unices, and because my Perl script works on Unices, this means that you can now create ERDs that generate SQL DDL for your database -- all without ever rebooting into Win32