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themes
Free WordPress themes made by Automattic for WordPress.org and WordPress.com. (by Automattic)
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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.
According to the maintainer of that, as you can see in the Q&A section on that page, they use a theme called "Varia" from WordPress's github as their starting point: https://github.com/Automattic/themes/tree/trunk/varia
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.