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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.
My best documented projects at the moment are https://sqlite-utils.datasette.io which provides both a CLI interface and a Python library and https://docs.datasette.io which has a bunch of configuration options plus an API for extending it with plugins.
The best material I've seen on building truly excellent comprehensive documentation is https://diataxis.fr/
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.