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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 also recommend having a look at the Guardian Coding Exercises and to read the description of the repository. I think they are a good example of tests that allow the candidate and the interviewer to work together, to actually meet and to discuss a solution. There is no "right" way to solve them, and many of them cannot be solved in 45 minutes, which is usually the time given to a candidate after an initial introductory chat.
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.