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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.
For fun, I just checked out the source from github (https://github.com/larrykollar/Unix-Text-Processing), installed a newer version of groff (OSX uses a version that doesn't build PDF files), edited the Makefile in the src directory to point at the new groff utility, and typed make. After 18 seconds on a mid-2011 iMac, I'd build the book (images and all) by hand.
NOTE:
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Hence, a higher number means a more popular project.