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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.
boum is open-source and you can get the APK from the Github repository, where you can also submit issues and patches. Note that it is necessary to allow the installation of apps from outside the Google Play Store.
There is also this https://github.com/ImranR98/Obtainium
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.