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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.
I would recommend learning Kotlin for Android though, it does help. I wrote this guide https://github.com/Zhuinden/guide-to-kotlin/wiki but you can also look at this video https://www.youtube.com/watch?v=wuiT4T_LJQo
NOTE:
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Hence, a higher number means a more popular project.