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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 just found MaruOS. It appears to be exactly what I was looking for. They are a little small apparently. They support only Nexus and Pixel phones and one Samsung's device. Hopefully they'll have a bright future.
NOTE:
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Hence, a higher number means a more popular project.