From our website (http://isis.apache.org):
Apache Isis™ software is a framework for rapidly developing domain-driven apps in Java. Write your business logic in entities, domain services and repositories, and the framework dynamically generates a representation of that domain model as a webapp or a RESTful API. Use for prototyping or production.
Isis works by building a metamodel from the domain object models, from which a generic user interface is generated dynamically at runtime. There are several implementations of the generic UI, one based on Wicket, one based on Servlet/JSPs, and one based on jax-rs and serving up a Restful API over http and json. This API is fully documented in the Restful Objects spec (http://restfulobjects.org) ... there is also a (non-Apache) open source implementation on .NET.