Unfortunately I cannot conccur with the reviews below.
The program looks fine but has oo many random bugs during editing to be usable. this is on Macbook with 10.5.5 and all latest updates.
I tried creating 5 tables, then in 1 of the tables about 12 fields of different types. I Got random errors, exception not handled, SQl errors when trying to rename tables, change types for fields.
Simple example: create table Master, hit enter - commit. create some table Fields
double click on Master, change M to m lower case, click enter - all your fields just disappeared. You must close and reopen the DB.
Also at one point it corrupted my DB( created datecreated field, left the type blank to think if I wanted date or timestamp, make a search in firefox (loose focus) come back to app - change to timestamp - error. When I reopen the database the whole table is gone!
So, looks promising, but stay away for now until those basic things are fixed.