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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.
What do you mean by legit? Proxmark is a GPLed project and made by whoever wants to make them. To the best of my knowledge there is no such thing as an ‘authentic’ Proxmark unless Jonathan Westhues himself built it for you, since he was the original creator of the device. It’s open source hardware; full schematics are here. Pretty much all of them are made overseas by contract manufacturers.
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.