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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.
Great tool, highly recommended for anyone who wants to add privacy to consumer cloud storage. https://cryptomator.org/
Yep, also want to point out the app is actually open source, the only reason it's paid on Google Play is so that you can support the devs: https://github.com/cryptomator/android
NOTE:
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Hence, a higher number means a more popular project.