Vienna is a freeware, open source RSS/Atom newsreader for the Mac OS X operating system. It provides features comparable to commercial newsreaders, but both it and the source code are freely available for download.
A summary of some of its features:
- Subscribe to Atom/RSS news feeds and podcasts.
- Simple and intuitive user interface.
- Built-in tabbed browser.
- Smart folders for organising related feed articles.
- Custom article display styles.
- Full AppleScript support.