-
CLI11
CLI11 is a command line parser for C++11 and beyond that provides a rich feature set with a simple and intuitive interface.
-
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.
I found https://github.com/jarro2783/cxxopts to be useful and https://github.com/CLIUtils/CLI11 to be really helpful if you need an non-trivial interface.
I use TCLAP (Templatized C++ Command Line Parser). I found this library 6 years ago, and I added it to all my projects. It's based on STL and works on every platform. https://github.com/mirror/tclap/
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.