awesome-dos VS awesome-cpp

Awesome DOS on GitHub might be a good place to start.

Awesome DOS — curated list of references for development of DOS applications

Sure. I think that this list here has almost everything one could want.

Regardé: Awesome-CPP

Here's a list of (globally) well-written C++ libraries: https://github.com/fffaraz/awesome-cpp

Here is a list of free online C/C++ books: https://github.com/fffaraz/awesome-cpp/blob/master/books.md

If you need some library you can try searching thjs list https://github.com/fffaraz/awesome-cpp

Here's a big list of a bunch of high quality C++ libraries and codebases. Hopefully you can find something in your areas of interest and can dive into it.

Could you detail what exact tooling you are talking about ?

Like, this static analyzer looks interesting but 5 years ago clang --analyze had no trouble producing me a nice html indicating the 27 steps across 6 functions that lead to a pointer being dereferenced after being deleted. Tooling is there but it seems that pretty much no one is aware of it - see e.g. this: https://github.com/cpp-best-practices/cppbestpractices/blob/... or this: https://github.com/fffaraz/awesome-cpp for a quick look at what exists.