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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.
Tracking in general. An app doesn't need your camera to see you're connecting from the US, with an expensive phone, or even the list of apps you have installed. Android has some alternatives to showing these, but they're not built in. Exodus is the one I use.
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.