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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.
As a matter of fact, you can gain a lot of insight into package development by reading the source code of packages themselves. siunitx in particular makes great use of modern (read: LaTeX3) code, and it is immensely powerful.
NOTE:
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Hence, a higher number means a more popular project.