Restlet Framework is a RESTful Web API framework for Java. This documentation corresponds to the Java Standard Edition edition. It is composed of the Restlet API documented here and of a supporting Restlet Engine. In addition, there are several Restlet Extensions available.

The Restlet Framework is led by Talend. with the help of the Restlet community.
Restlet API 
Package Description
org.restlet
Core classes of the API.
org.restlet.data
Information exchanged by components.
org.restlet.representation
Common representation data elements.
org.restlet.resource
Client and server resource classes.
org.restlet.routing
Classes related to call routing.
org.restlet.security
Classes related to security.
org.restlet.service
Services used by applications and components.
org.restlet.util
Various utility classes.