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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.
IMO the best way to get into this type of low-level tinkering is by writing a simple operating system.
https://github.com/isometimes/rpi4-osdev
There are other courses/projects for other boards. The keyword is usually “baremetal”.
For Linux drivers specifically there are training material from Bootlin for instance.
NOTE:
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Hence, a higher number means a more popular project.