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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:
crt: Split out the strtold/wcstold frontend aliases to separate object files
crt: Regenerate Makefile.in
crt: Add APIs in ntdll.def
headers/mfidl: Regenerate from IDL
headers: Add ioringapi.h
headers: Add NTDDI_WIN10_CO in sdkddkver.h
headers: Add some names in mstcpip.h
headers: Add MFTranscodeContainerType guids
This should have been fixed by https://sourceforge.net/p/mingw-w64/mingw-w64/ci/021dffb8a482eb9d1b39569cd1ea42b87226fdf7/.
This should have been fixed by https://sourceforge.net/p/mingw-w64/mingw-w64/ci/66ba5f3221c786de24f5fc4b9c0236b704c2d31d/ and https://sourceforge.net/p/mingw-w64/mingw-w64/ci/021dffb8a482eb9d1b39569cd1ea42b87226fdf7/.