JBoss.orgCommunity Documentation
Gadgets are web-based software components based on HTML, CSS, JavaScript; defined by using an XML declaration syntax. They allow developers to easily write social applications that work on the social networks supporting OpenSocial APIs without modification. See the following links for detailed information:
To know how to create an OpenSocial gadget, see here.
Gadgets will work out of the box on Dashboard. In eXo, gadgets are wrapped by GadgetWrapperPortlet so they can work as any other portlet applications. At present, Social supports OpenSocial Specification v1.1.