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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 thought the reddit discussion did a better job explaining it, but here are the direct links:
https://lokl.dev/
https://github.com/leonstafford/lokl
The developer, Leon Stafford, is also working hard on WP plugins that convert to static sites and even upload directly to popular services such as Cloudflare, Netlify, Amazon, etc.
(I am not associated with this project.)
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.