Recently I have been fooling around with the Google WindowBuilder Pro. This is the best GUI builder for Java I have used so far. My only complaint: it is quite unstable! For the rest, it is very easy to use, especially support for LayoutManagers is superb. I used it to create some configuration dialogs for the Infolog Desktop application and today I released Infolog version 2.1. Configuration of the look and feel and the synchronization is now much easier through these dialogs: