RSSOwl is a free RSS / RDF / Atom Newsreader in Java using SWT as fast graphic library. Supported OS are Windows, Mac, Linux and Solaris. Some features are powerful searches, embedded browser, tray notifications, clean-up wizard and user customization. RSSOwl requires no installation, simply start it with a doubleclick and find a huge list of sample feeds already provided. You can also easily import existing feeds from other readers into RSSOwl.