Well, this isn't specifically a database design tool, but you can use Dia, a generic open-source diagramming tool, to make E-R diagrams (among other types). No support for/integration with database ...

Sybase Inc.'s goals for PowerDesigner are nothing if not ambitious: a single modeling tool for tracking data definitions everywhere in an organization -- and Sybase doesn't just mean databases when it ...

Data modeling is the procedure of crafting a visual representation of an entire information system or portions of it in order to convey connections between data points and structures. The objective is ...