谁能为C ++ STL做出贡献?

I am using C++ for couple of years and I am wondered how it works. So, I felt interested to see how this project is managed, gone through some google search but found nothing. So, I just want to know that is C++ STL implementation is a open source project like GitHub open source projects or can anyone request for a library that does not exist in c++ but exist in other language or can anyone implement their own version of header and request them for review it?

提前致谢