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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.
Keystone's firmware of gen2 is already open source, and gen3 I think is being released as 100% open source soon. So you can check everything, and build it yourself. Otherwise you can double-check the checksum of the downloaded binary before you put it into your Keystone.
NOTE:
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Hence, a higher number means a more popular project.