C++ Libraries

 https://en.cppreference.com/w/cpp/header

 https://isocpp.org/std/status

https://en.wikipedia.org/wiki/Asio_C++_library

 https://en.wikipedia.org/wiki/Boost_(C%2B%2B_libraries)

https://pocoproject.org/index.html 

https://en.wikipedia.org/wiki/POCO_C%2B%2B_Libraries

 https://www.openssl.org/

 https://www.ffmpeg.org/

https://en.wikipedia.org/wiki/Adaptive_Communication_Environment 

https://www.sqlite.org/index.html

https://en.wikipedia.org/wiki/Category:C%2B%2B_libraries

https://en.wikipedia.org/wiki/Comparison_of_WebSocket_implementations