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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.
If you want a simple phone type tracker, there's a add-in for Nextcloud called PhoneTracker. I use it for my small business to decide which employee is closer to a service call. PhoneTracker
You could have a look at https://owntracks.org/ Open source has iOS and android apps. Easy to write tools for. Uses mqtt message broker underneat.
NOTE:
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Hence, a higher number means a more popular project.