Repose is an open-source RESTful HTTP proxy service that scales to the cloud. Repose provides a solution to common API processing tasks such as rate limiting, client authentication, translation, API validation, versioning and logging so web service developers can focus on the unique features of their services.
Atom Hopper is an open source Java Atom publishing server for accessing, processing and aggregating Atom entries. Rackspace designed Atom Hopper to make it easy to build both generalized and specialized persistence mechanisms for Atom XML data; it’s based on the Atom Syndication Format and the Atom Publishing Protocol. We’ve started from the Apache Abdera project and built a well-rounded Atom publishing server that is easily deployed on a Java servlet container such as Apache Tomcat 7.