"Using Really Simple Syndication (RSS) or Atom feeds to check your favorite sites and blogs can be a big time-saver. However, if you use more than one computer or operating system, managing your feeds and tracking updates is more difficult. Gregarius, a Web-based server-side aggregator that supports RSS, RDF, and Atom feeds, can help.
"Gregarius is written mainly in PHP, and available under the GNU General Public License (GPL)..."