I've started with C++ a couple of years ago and openFrameworks has been my entry ticket: https://github.com/openframeworks/openFrameworks https://github.com/ope

I've started with C++ a couple of years ago and openFrameworks has been my entry ticket: https://github.com/openframeworks/openFrameworks https://github.com/openframeworks/openFrameworks. The code base is quite simple and readable, because it consists of several self-contained modules, many of which are just wrappers around existing libraries. For a "professional" code base, you could have a look at JUCE, which is also very modular: https://github.com/juce-framework/JUCE https://github.com/juce-framework/JUCE Both projects are written in "modern C++" (C++11 and above).