JeCARS (Java Extendable Contents And Rights System) is a RESTful webservice which delivers pluggable output formats, e.g. Atom feeds or HTML.
Third party applications can be plugged in.
A JCR (JSR-170) repository (Jackrabbit) is used for storage.
Newsagent is an RSS feed aggregator that offers a combination of flexibility and simplicity. Built on an established plugin architecture (OSGi), Newsagent provides a solid base for building custom RSS-enabled applications.
A java framework for developing applications that aggregate data from different sources and combines their responses.It can be used for developing web mashups or as a lightweight enterprise service bus (ESB) in service oriented architectures (SOA).