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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.
There is a way to get a hacked Google Play store using NanoDroid (and possibly through other means but I'm not sure) that allows you to do in-app purchases, which might make your on-phone experience a little closer to using the stock google play store, but keep in mind that since many back-end services are replaced, not everything might work all the time. But as far as I know, things work pretty well all things considered (which is a huge testament to the quality of work put into this by the devs).
NOTE:
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Hence, a higher number means a more popular project.