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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.
If you're not as comfortable with git as you'd like to be, I highly recommend the first three chapters of this free book, written by the creators of GitHub. (The other chapters are excellently written as well, it's just that the content isn't your bread-and-butter.) Also, use this quick, free game to practice.
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.