Miniflux - Miniflux is a minimalist web-based RSS reader. It's very easy to use.
RSS Guard - RSS Guard is simple (yet powerful) feed reader. This is the official project repository. - martinrotter/rssguard
Inoreader - Dive into your favorite content. The content reader for power users who want to save time.
BazQux Reader - Fast, clean and unique feed reader
QuiteRSS - Cross-platform RSS/Atom news feed reader written using Qt.
Fluent Reader - Modern, open-source desktop RSS reader