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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.
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android-foss
A list of Free and Open Source Software (FOSS) for Android – saving Freedom and Privacy.
See for yourself, as it would be impossible to guess what is right for you as an individual:
https://f-droid.org/
As others have mentioned, Aurora Droid and Aurora Store are helpful alternatives to the Google app store.
https://gitlab.com/AuroraOSS/auroradroid
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.