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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 want an example of a really optimized bash script check out my forkrun utility. I spent a really long time optimizing it. It parallelizes loops (like xargs -P and parallel), and for problems with "many very quick iterations" (e.g., sha256sum of a million tiny files) it is twice as fast as the fastest method available via xargs or parallel (which means it is outpacing well optimized compiled C/C++ binaries).
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.