RSS - Really Simple Syndication

Does anybody have any recommendations for FOSS RSS readers with actual content surfacing features? So many RSS feeds are full of junk (this is particularly a problem with feeds with wildly disparate posting frequencies) and I've always felt they'd be a lot more useful if people were putting more effort into a modern way to sort through extremely dense feeds.

EDIT: Actually just stumbled on one for mobile. Check out Nunti on android (https://gitlab.com/ondrejfoltyn/nunti)