https://github.com/microsoft/STL is our new repository, containing all of our product source code, a new CMake build system, and a README with more information...
MSVC’s STL is distributed under the Apache License v2.0 with LLVM Exceptions, which was recently created by the Clang/LLVM/libc++ project. We chose this permissive open source license because having the same license as libc++ will make it easier to share code between our libraries.
We’ve shipped both the headers and the sources in the VS installer for years, but “readable source” under the VS EULA is totally different from open source under our new license. This is about being able to contribute to our code, and to take pieces for use in other projects.
We're going to use GitHub issues to track all of the things that we need to work on. This includes C++20 features, LWG issues, conformance bugs, performance improvements, and other todos. There are approximately 200 active bugs in the STL's Microsoft-internal database; we need to manually replicate all of them to GitHub issues.