Best foundation for a JDBC Client

I would like to build an application in JAva that provides a GUI front-end to a JDBC compatible database. The GUI will be designed for those that are not familiar with SQL and other database technology. It will include features like a QueryBuilder and TableBrowser.

I thought I would build my application on top of an existing JDBC client. I have investigated 2 so far:

ISQL (http://www.isqlviewer.com/)
Squirrel (http://squirrel-sql.sourceforge.net/)

Does anyone have some other suggestions for other programs that I could use as a potential foundation for my applications? If not, which of the 2 listed above would be the best choice, and why? The code would need to be open source, and I'm hoping to find something with an active developer's community.

Landon
[ June 21, 2005: Message edited by: Bear Bibeault ]