RSS aggregators

Alligator is a convergent RSS/Atom feed reader. Free and open source program

Tickr is a free and open source RSS/Atom reader with a news feed ticker on the desktop

GNOME Feeds is a free and open source minimal RSS/Atom feed reader built with speed and simplicity in mind for GNOME

QuiteRSS is a free and open source, cross-platform software for reading RSS/Atom news feeds

RSS Guard is a free and open source, simple but powerful news feed reader with support for web services

Raven Reader is a free and open source, multi-platform and simple news reader

Fluent Reader – free and open source cross-platform modern desktop RSS reader

NewsFlash is a free and open source RSS reader client with the ability to sync with third-party services

Akregator – free and open source is a news feed reader, that supports RSS and Atom feed formats with a built-in web browser