4WS.Platform has been developed above an open source sdk, called WARP.
WARP is a Java based framework that can be used to develop rich web applications, based on JPA, JDBC, EJB, Java Beans, JAX-RS, ExtJS technologies.
WARP is an open source project powered by Sinesy and available through SourceForge portal.
Custom code to add to 4WS.Platform can be developed using the same framework, which represents the SDK of the platform to use when creating custom functionalities by coding them: in this way your custom code is perfectly integrated with the rest of the interpreted functionalities.
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