How do I create forms with a layout where some fields just stick to a certain width and other fields resize when the form resizes. I tried a lot of field property combinations but never get it working.
Perhaps there are some examples of complex screen layouts.
I am afraid there is no open-source application with big form or complex layout. The Scout Layout manager covers a lot of use cases (sometime it can be tricky: addition of empty label fields, or really fine tuning of parameters).
Maybe you could sketch a wireframe of the form you want to have (I recommend WireframeSketcher). Add the picture here. And we can try to provide you some inputs.
If you have not so crazy needs, I am confident that you can implement them with Eclipse Scout.