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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.
This is excellent if bare bones. It's meant for "the clean slate" style of CSS development. To be honest, I do less and less of starting from zero.
Another style is a more built up starting point like PicoCSS. https://picocss.com/
Both have their place and their use cases.
NOTE:
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Hence, a higher number means a more popular project.