Apache Shindig

Shindig - an Apache incubator project for OpenSocial and Gadgets

The architectural components of Shindig can be broken down as follows:

Gadget Container JavaScript -- core JavaScript foundation for general gadget functionality. This JavaScript manages security, communication, UI layout, and feature extensions, such as the OpenSocial API.
Gadget Server -- an open source version of Google's gmodules.com, which is used to render the gadget XML into JavaScript and HTML for the container to expose via the container JavaScript.
OpenSocial Container JavaScript -- JavaScript environment that sits on top of the Gadget Container JavaScript and provides OpenSocial specific functionality (profiles, friends, activities, datastore).
OpenSocial Data Server -- an implementation of the server interface to container-specific information, including the OpenSocial REST APIs, with clear extension points so others can connect it to their own backends.