> (GNOME) Dia has a toolset for ER diagrams. It is not too pretty, but it 
> works. If you want high-quality output, it is better to look at graphviz 
> or plain-old pic.
> 
> -- Daniel
> 

Graphviz looks like a script language to me. Not a graphical tool. Dia 
works nice for ERDs, but lacks other design tools.