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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.
Yea, Killed by Google has been documenting this well before The Verge decided to swoop in.
I myself still use RSS fairly regularly. I use a Miniflux instance. https://miniflux.app I highly recommend it!! Google didn't kill RSS when it shut down reader, it just killed reader.
NOTE:
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Hence, a higher number means a more popular project.