In the last years different methodologies have been proposed to systematize the Web development processes. Some of them are supported by CASE tools that help the user in all or in part of the phases of the application development. A number of these tools are used with didactic aims, for teaching the development process of Web applications. 4evertheless, to our knowledge, none of the currently available CASE tools neither supports the online cooperative design, nor allows the modelling of a process with the supervision of a teacher. Our technological solution is based on Rich Internet Applications (RIAs), i.e., Web applications with multimedia, high levels of interactivity, and collaborative work support. This document presents a Rich Internet application for the automatic code generation of Web applications that allows different modellers to design Web applications in a cooperative and supervised way, as well as to automatically generate its code. This work is inspired by the Web modelling language WebML.