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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.
It's actually not closed source and even more funny you end up with less hard to check third party dependencies when you run the open source Bitcoin application (https://github.com/ledgerhq/app-bitcoin-new) on a Ledger device.
NOTE:
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Hence, a higher number means a more popular project.