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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.
Square documented how they acquired and are holding bitcoin at https://images.ctfassets.net/2d5q1td6cyxq/5sXNrlEh2mEnTvvhgtYOm2/737bcfdc15e2a1c3cbd9b9451710ce54/Square_Inc._Bitcoin_Investment_Whitepaper.pdf and https://github.com/square/subzero.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.