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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.
My articles (https://senatus.substack.com/) provide a fair bit of extra background as well, and the Nano blog (https://nano.org/en/blog) has a lot more articles. There's also the community-run Nano.community (https://nano.community/).
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.