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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.
Check out sabotage [https://github.com/sabotage-linux/sabotage]. Musl, busybox and busybox init + runit services. 38MB of RAM on my machine, it's self hosting so I guess meant for desktop use.
NOTE:
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Hence, a higher number means a more popular project.