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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.
Paper wallet - offline generated by the open source one: https://github.com/anon-br/ergo-paper-wallet. If you have an old android phone you could also put it in flight mode forever and use that for cold storage, too.
NOTE:
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Hence, a higher number means a more popular project.