"AsWing is an Open Source Flash ActionScript GUI framework and library that allows programmers to make their flash application (or RIA) UI easily. Its usage is similar to Java Swing." [quoted from AsWing homepage]

The team who created and maintains AsWing developed also an GUI Builder Air application, using which you can speed up your GUI developmnent.

So far now this is the only GUI framwork I know for flash. If you use it in your commercial (or other) project, please dont forget to donate (http://www.aswing.org/?page_id=173) and reward so the hard work the developers had put in AsWing.

Script Image: