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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.
2017, code link: https://github.com/seaglass-project/seaglass
Pi connected to a Cell modem, mobile hotspot, and "bait phone" ... and a separate GPS.
All powered by wall warts off an inverter to the car's 12v system.
This makes me feel better about my own systems designs.
This is no longer being maintained as of 2022, but I think is more recent than SeaGlass.
https://github.com/EFForg/crocodilehunter
NOTE:
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Hence, a higher number means a more popular project.