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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.
If they don't have an RSS link there's a github page https://github.com/AboutRSS/ALL-about-RSS and there's a way to code it, but, I am lazy. There's also aggregators but they require accounts (and I'm anti-accounts rn).
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.