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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 you do decide to go self-hosted RSS, try FreshRSS. TTRSS is good but the author is a toxic asshole who likes to ban people in his forums if he feels your questions are beneath him and he has a little clique of hangers-on who enable his shitty behaviour.
https://github.com/BookStackApp/BookStack/releases.atom
No. I've been running my own for over 16 years.
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.