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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.
Go to this link and download AuroraStore_4.2.3.apk, an open source client that fetches files directly from the Play Store servers. Here is an FAQ for the project if you're worried about safety or breaking Google ToS. This method is safe but you can choose to create a new Google account for the login if you're not comfortable using your main account.
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.