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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.
I've been following this roadmap. It is very extensive and also gets into the philosophy behind math and some basic physics. You don't have to follow every branch though. Some branches, like the philosophy and physics, are marked as optional.
NOTE:
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Hence, a higher number means a more popular project.