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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.
find_package(Python3 ...) will look for a file FindPython3.cmake shipped with CMake. I urge you to try to go over its contents to get an idea of what it does underneath.
Lastly, if you still think it's frustrating to have to specify path to every dependency then jump on the modern C++ development wagon and start using a package manager like Conan or vcpkg.
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.