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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.
Here is repo https://github.com/t4th/cortex-m3-rtos You have two branches with simple prove of concepts if you are curious about technical problems only.
Got a few, for example https://github.com/jakkra/RoverController https://github.com/jakkra/Mars-Rover
NOTE:
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Hence, a higher number means a more popular project.