Looking for "real" C++ simple projects to be used as test data

As a study, I'm working on a C/C++ build system made from scratch but still use standard compilers/linkers like GCC or MSVC (think about a \*very\* simplified version of CMake)


I want to test it with some "real" (but simple) projects which meet these criteria:

* multiple source files (let's say minimum 10 sources files, maximum 100)
* build with CMake (for easy conversion to my own build system)
* no dependency (except system libraries, but do not depend on third parties)
* windows and/or linux
* produce some executable files which can be easily tested


My goal is to take these projects, build them, and check it the build is ok.


I've looked on Github, but all projects are really too simple (like a single source file) or really to too complex (like you need to build 2 or 3 other libraries before building the project).


I don't care about what the source code does : it can be anything, I just want some correct input for my build system.


Do you know any project that will be suitable for my use ?

https://redd.it/1q3s8hn
@r_cpp