argoUML is the most popular open-source (BSD license) UML tool.
You can also try free version of DBVisualiser
http://www.dbvis.com/products/dbvis/
If you use Eclipse IDE then there's a free Database Modelling
plugin for it from Azzurri Clay
http://www.azzurri.jp/en/software/clay/screenshots.jsp

--- In firebird-support@yahoogroups.com, JHCue@a... wrote:
> Hi,
>
> Try Poseidon for UML from Gentleware, it is (like Firebird) a
project born
> from the open source ArgoUML, with many improvements and fixes.
>
> You can download a Community Edition (free) from
http://www.gentleware.com
>
> Regards
>
> En un mensaje con fecha 24/03/2004 04:45:08 p.m. Hora estándar romance,
> albis@e... escribe:
>
> > Daniel Berstein wrote:
> > >As for UML I've seen an opensource one called ArgoUML
> > >(http://argouml.tigris.org/). Can't really rate it since I still just
> > >don't get under my skin UML (funny thing that's just the same feeling
> > >I have with Perl).
> >
> > I tried it recently. It's still alpha quality, so you better avoid it.
> >
>
>
>
> [Non-text portions of this message have been removed]