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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.
This may come as a shock to you, but the ones that are private don't have 14 trackers in their apps (Nextcloud has 1, Element has 0, Signal has 0, OsmAnd has 0, OpenCamera has 0, all apps in https://www.simplemobiletools.com/ have 0, I can go on for a long time). Who knew?
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.