RSSOwl is a fast, free Java-based newsreader that supports RSS, RDF, and Atom formats. It comes with a range of useful features, such as powerful searches, an embedded browser, tray notifications, a clean-up wizard, and user customization. Compatible with Windows, Mac, Linux, and Solaris.

One of the standout features of RSSOwl is its cross-platform capabilities – it runs smoothly on Windows, Mac, Linux, and Solaris. Additionally, I love that RSSOwl requires no installation – all you need to do is double-click to start it up, and you'll have access to a massive list of sample feeds that are already provided. If you have feeds from other readers that you'd like to bring over, you'll be happy to know that RSSOwl makes importing existing feeds a breeze. Simply use the popular OPML format to get started.
Another highlight of RSSOwl is the user customization – you can tweak it to fit your specific needs by choosing from a wide range of powerful searches, tray notifications, and an embedded browser. The clean-up wizard is a particular favorite of mine, as it helps me keep all of my feeds organized and tidy.
Last but not least, the owl in RSSOwl's name is no coincidence. Owls are traditionally known as symbols of wisdom and efficient hunters – just like this RSS reader! With RSSOwl's "big eyes," you'll be able to search through the Web's vast array of RSS resources with ease. All in all, it's a fantastic choice for anyone in need of a reliable and efficient RSS reader.
Version 2.2.1: This update provides fast access to actions on an article below its content and addresses some issues with keyword feeds. Please visit http://www.rssowl.org for a list of changes.