Whoever deleted it without further notice - there is a comment area underneath, you can add your concern there.
I'm using Eclipse and - well, there are some WYSIWYG-Editors out there. But I can't really recommend them, as the code they produce is not really what I want to have. Overview on Java GUI Builders
Most of them are licensed products.
To my point of view it's better to stay with a good design and hand coded GUI, which makes it much more maintainable.