The layout showcase is up and running at http://layout.demo.nuxeo.org!
This application is mainly useful to developers who design layouts for document creation, edition and view pages, as well as layouts for document listings: it provides how-to documentation, demo and preview for most of the default widget types.
Here are some screenshots for the very common "text" widget type.
The "Overview" tab provides a quick introduction to what the widget does and displays a demo widget with a sample configuration.
The "Reference" tab shows more details about the widget definition and shows all the properties accepted by this widget, depending on the mode (edit, view...).
The "Preview" tab makes it possible for the user to try out a custom configuration and preview the resulting widget.
For more information about how this application was created and how it's useful to the Nuxeo framework, as well as developers, have a look at the about page.