Apps similar to FeedZero include Feedly, which has a free version. Other options are Inoreader, FreshRSS, Feeder and Fluent Reader. RSS Readers like FeedZero are a crowded field, with more than 25 alternatives for Linux, Android, iPhone, the web and Mac.
selfoss is a multipurpose RSS reader and feed aggregation web application. It allows you to easily follow updates from different websites, social networks and other platforms, all in a single place. It is written in PHP, allowing you to run it basically anywhere.
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A modern feed reader designed for the GNOME desktop. NewsFlash is a program designed to complement an already existing web-based RSS reader account.
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FeedMe is a simple and full featured offline RSS reader for Feedly, InoReader, Bazqux, The Older Reader, Feedbin, Tiny Tiny RSS, FreshRSS, Fever, aiming at providing the best user experience for users to read and manage your favorite articles.
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The News app is an extension to Nextcloud. Essentially it is an RSS/Atom feed aggregator and offers a RESTful API for app developers. There are several clients, also for mobile devices.
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