C++:

https://ru.wikipedia.org/wiki/C%2B%2B

Polymorphine:

https://github.com/epanteleev/polymorphine.git

Unit Testing:

Catch: https://github.com/catchorg/Catch2.git

Google Test: https://github.com/google/googletest.git

Net libraries:

Boost ASIO: https://www.boost.org/doc/libs/latest/doc/html/boost_asio/overview/networking/protocols.html

Libcurl: https://curl.se/libcurl/

Buildsystem:

Cmake: https://cmake.org/

Make: https://www.gnu.org/software/make/

MS build: https://learn.microsoft.com/ru-ru/visualstudio/msbuild/msbuild?view=visualstudio

Posix:

https://ru.wikipedia.org/wiki/POSIX