Liferea

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A nice, lightweight feed reader for Linux that does the basics: lets you subscribe to RSS and Atom feeds and read the new posts when you feel like it. Does its job, doesnโ€™t hog resources, and stays out of the way.

Downsides: Doesnโ€™t sync your subscriptions and read/unread status with anything. If you need that, I recommend NewsFlash.

More info at Liferea.