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paparazzi
Paparazzi is a free and open-source hardware and software project for unmanned (air) vehicles. This is the main software repository. (by paparazzi)
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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.
Found this to do the math: https://github.com/paparazzi/paparazzi/blob/master/sw/airborne/modules/decawave/trilateration.c
NOTE:
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Hence, a higher number means a more popular project.