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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.
Yes, only foss and built-in aosp things, but nanodroid adds some more apps: https://gitlab.com/Nanolx/NanoDroid/-/blob/master/doc/Applications.md
NOTE:
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Hence, a higher number means a more popular project.