We present WebRatio 5.0, a design tool that supports WebML (Web Modelling Language). WebML is a domain specific language (DSL) for designing complex, distributed, multi-actor, and adaptive applications deployed on the Web and on Service Oriented Architectures using Web Services. WebRatio 5.0 provides visual design facilities based on the WebML notation and code generation engines for J2EE Web applications. The tool is developed as a set of Eclipse plug-ins and takes advantage of all the features of this IDE framework. It also provides support of customized extensions to the models, project documentation, and requirements specifications. The overall approach moves towards a full coverage of the specification, design, verification, and implementation of Web applications.