.ATOM

.ATOM file extension

This is the basic program to work with .ATOM extension

Snarfer

SnarferAtom Feed

Snarfer is an easy-to-use application which allows you to read, search and manage RSS feeds from any website on the Internet supporting the technology. And best of all, it doesn't cost you a penny. It is not a system resource hog and minutes after installation you will be aware of the usability and flexibility of the RSS Reader... (more)

The program works with the following extensions: rss, atom, opml and snarfer