You can test the demo form designer instance at: http://purcforms.appspot.com/FormDesigner.html
The form run time engine is also used to create a FormEntry widget which can be used for data entry in offline mode. The connection to the server is needed only when downloading forms and sending collected data back to the server. During filling of forms, they are saved on the local computer. With an HTML5 enabled browser, you should be able to access the FormEntry widget even without a server connection.
You can try out the demo at: http://purcforms.appspot.com/FormEntry.html