AtomEnabled

Sage is a lightweight RSS and ATOM feed aggregator extension for Mozilla Firefox.

MMi BLog is your perfect mobile compagnon for world's Bloggers. Manage your blogs with your mobile device.

clevercactus pro is a multiplatform personal information manager with an integrated newsreader that supports Atom and RSS.

BlogWrite is a Japanese blogging client that enables bloggers to write their entry from desktop application. BlogWrite let you edit HTML with a WYSIWYG edititor AND highly configurable HTML editor.

Liferea (Linux Feed Reader) is an aggregator for online news feeds. It supports a number of different feed formats including RSS/RDF, CDF, Atom, OCS, and OPML. Liferea is a a fast, easy to use, easy

Fully featured RSS reader that's free to download and use. Pluck is a plug-in to Internet Explorer and allows you to read your news from wherever you are on the web. CNET's Editor's Choice.

BlogMatrix Jäger is an extensible "one-panel" news reader that uses your browser to display blogs and their entries. Jäger runs under Windows and on Macintosh OS 10.3.

News aggregator that wants to make the news reading experience the most pleasant possible: anti-aliasing support on any operating system, skins support, and multi-language support.

A highly configurable RSS and Atom animated news reader.

akregator is a fast, lightweight feed reader program for KDE and Linux/UNIX. It has supported Atom since it's first public version.