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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 use PhoneTrack to log my position to a private Nextcloud server. It works great and you can even have different logs running at the same time, like one for every day tracking and one with more resolution for hiking.
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Hence, a higher number means a more popular project.