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STM32CommandLine
STM32 shell, a CLI(command line interface) like linux shell, you can easily port into an embeded system, all you need is a serial com port : )
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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.
Alternatively, you could get really lucky and find the board has no memory protection bits set and just dump the firmware using an arduino.
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.