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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.
Yeah saw it a lot when control hub first came out. Now see people use it for the acceleration from photon - https://github.com/Eeshwar-Krishnan/PhotonFTC. I believe it is legal.
NOTE:
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Hence, a higher number means a more popular project.