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:
missing import library symbols for i686
widl: Updated to current Wine version.
rpcndr.h: Fix MIDL_user_allocate declaration.
ddk/wdm.h: Remove the inline definition of `InterlockedAdd64()`.
Partially revert 97452087928e38c9bcf.
windowsapp: add gamemode.dll APIs
widl does not support acf option
This is fixed now, widl supports -acf option.
Regenerate headers using async_uuid with recent widl.