I have searched on and off for ages for decent forms layout software (preferably GUI and with a database behind it) and every time I think I may have found one it either fades aways into unsupported disuse or doesn't quite manage to provide the things I want.
Just to pad this out a little I'll list what I've played with over the years (not in any particular order, just as they come to mind):-
Knoda - looked promising once but is dead and unsupported now Rekall - as above, was semi-commercial anyway Dabo - quite nice, good support but no forms GUI Sqledit/Sqlkit - I can't quite get it to work for me kexi - good, except that scripts and subforms are missing still glom - seems to be going the way of all forms GUIs, no activity
I know lots of projects die but it seems particularly common with these!