A GUI framework application to show all widgets with different themes
http://www.qooxdoo.org/qxl.widgetbrowser/
Clone this repo and compile it:
$ git clone https://github.com/qooxdoo/qxl.widgetbrowser
$ cd qxl.widgetbrowser
$ qx pkg install
$ qx serve
Then open http://localhost:8080