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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 instance, try to build this project: https://github.com/OpenImageDenoise/oidn - it uses CMake. It will take you some time to build it - since you need first to figure out its dependencies and how to install them - if you have no idea of its dependencies it might take you a few days to figure out how to build it for your platfom. I call this the Build Problem - this is the struggle to build something.
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.