BlogBridge
BlogBridge is a new kind of Blog reader, designed for the non-technical user to discover, follow and enjoy literally hundreds of feedss without losing their mind. BlogBridge is an Open Source project, so it is free to download and use. On this Web site you will find lots of information both for end users and for developers.

Curn
Curn is an RSS reader. It scans a configured set of URLs, each one representing an RSS feed, and summarizes the results. By default, curn keeps track of individual items within each RSS feed, using an on-disk cache; when using the cache, it will suppress displaying information for items it has already processed (though that behavior can be disabled).

FeedParser
Jakarta FeedParser is a Java RSS/Atom parser designed to elegantly support all versions of RSS (0.9, 0.91, 0.92, 1.0, and 2.0), Atom 0.5 (and future versions) as well as easy ad hoc extension and RSS 1.0 modules capability.

Flock
Flock is an RSS aggregator written in Java. It is a server-side web application accessible with a browser, similar in spirit to AmphetaDesk .

HotSheet
HotSheet is a program that retrieves news headlines from multiple websites, displays them, and allows you to interact with them (e.g. to get the story that goes with a particular headline).

Informa
The goal of the Informa Project is to provide a news aggregation library based on the Java Platform. The idea was born by the authors of two Java news reader applications (HotSheet and Risotto). We intended to unify the common parts into a library which can be used by any developer who needs to address those issues in their application.

Jena
Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, including a rule-based inference engine.

JSwingReader
JSwingReader is a Java/Swing RSS NewsFeed Reader.

nntp//rss
nntp//rss is a Java-based bridge between RSS feeds and NNTP clients, enabling you to read your favorite RSS syndicated content within your existing NNTP newsreader. RSS feeds are represented as NNTP newsgroups, providing a simple, straightforward and familiar environment for news reading.

ROME
ROME is a set of Atom/RSS Java utilities that make it easy to work in Java with most syndication formats. It includes a set of parsers and generators for the various flavors of feeds, as well as converters to convert from one format to another.