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.
initial Release: 2016-10-19
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:
ucrtbase: Make sure that compat symbols aren't autoexported
Windres not accepting spaces in include directory path.
crt: Share shlwapi.def between lib64 and libarm32
headers: Avoid producing repeated "static static" in __mingw_static_ovr
crt: Regenerate Makefile.in
headers: Avoid using the dllimported versions of Interlocked functions on i386
crt: Provide compat wrappers for the unprefixed "timezone" and "tzname"
Slow scanf or printf