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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.
Code if your interested https://github.com/nasa/fprime
However, if you were to try. The best FOSS kernel for getting these types of certifications would probably be seL4.
NOTE:
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Hence, a higher number means a more popular project.