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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 https://gitlab.com/eneiluj/phonetrack-oc/-/wikis/userdoc#owntracks
You might be able to link https://owntracks.org/ to a nextcloud instance. As owntracks is on iOS https://apps.apple.com/us/app/mqttitude/id692424691
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.