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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.
But since you've already read a few OS books, I suggest you move on to actually peeking under the hood and playing around with the concepts. OSTEP has problems at the end of each chapter you can check out. You can also try to hack into a real "toy" operation, like xv6 - check out the problems here.
NOTE:
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Hence, a higher number means a more popular project.