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NewsBlur
NewsBlur is a personal news reader that brings people together to talk about the world. A new sound of an old instrument.
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rssguard
Feed reader (and podcast player) which supports RSS/ATOM/JSON and many web-based feed services.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I like Newsblur. It's open source and doesn't call home on the iOS app. No tracking, just very good imo.
I'm use RSSGuard
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.