Mingw-w64 is an advancement of the original mingw.org project, created to support the GCC compiler on Windows systems. It has forked it in 2007 in order to provide support for 64 bits and new APIs. It has since then gained widespread use and distribution.
The development and community are very active and welcoming with new contributors every month and simple installers.
You can also look at the full list of versions.
Mingw-w64 interacts a lot with other projects in order to help everyone move forward. Contributions have been going to and coming from these projects:
include: Regenerate configure.
include/GL: Update to a more recent Git version.
Update GL headers to git-6f5d3d0
include/KHR: Update to more recent Git version.
ntstrsafe.h: Remove incomplete header.
ntstrsafe.h: More fully implement.
OpenSSL fails to build with internal compiler error
headers: Use the msvcrt/ucrt setjmp functions on ARM64 if SEH is available
crt: Provide an empty implementation of __set_app_type for msvcr120_app.dll
crt: Merge msvcr120_app.def.in for 32 and 64 bit x86