:: I am looking for a database modeling tool that is either GPL or
:: inexpensive. So far I have found 'DBDesigner 4', but it is a dead
:: project and the follow on 'MySql Workbench' doesn't have any info
:: website on its features and support. What do you suggest?

What is your definition of inexpensive?

IBAdmin (www.sqlly.com) has a nice designer.