Apache Wink is a Java based framework for building RESTful applications. It provides implementation of JAX-RS specification and is currently under Apache incubation.
Apache wink provides a service module for developing JAX-RS compatible RESTful services and client modules for creating RESTful clients. Apart from JAX-RS standard representations, Apache Wink provides and ability to expose resources using various representations formats like RSS, Atom and CSS formats.
From the official site -