DB Visualizer seems to be the most full featured SQL GUI tool out there. It has some data entry aids that really make it viable, such as automatic form view (on record per screen), adjustable grid views and filters for everything from table listing to rows of data. Some of the tools and options aren't immediately obvious but very impressive once you find them. It's a Java app which limits a lot of Mac OS X integration (eg all the windows move in Spaces together) and some controls (such as tabbed panes) don't work in the standard Mac way. It's 'Mac Look and Feel' setting makes DbVisualizer more palatable than most Java apps, but it's still a bit ugly and non-intuitive for Mac users. DbVisualizer, uses JBDC drivers to connect to the database. That takes a bit of fiddling which would scare off most users. I've tried two available JDBC drivers with SQLite (the most prolific database on the Mac) and only get limited functionality. For instance, I can't get DbVisualizer to show me the source of a selected table or view, I can't see triggers in the list. Every time I make changes to data, DbVisualizer complains that 'no rows were affected by this edit', but the changes were actually made. Overall it's a great program that I can't yet use until SQLite access is fixed.