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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.
Secondly, FCOS build is documented and is easy to build your own custom base image: https://github.com/coreos/coreos-assembler/blob/main/docs/building-fcos.md. You can build anything including installers, live boot ISOs and PXE boot images.
NOTE:
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Hence, a higher number means a more popular project.