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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:
include/stdio: Move macro push/pops outside any `#if...#endif` blocks
crt: _HUGE for UCRT
crt: regenerate Makefile.in
headers: Add more GUIDs in mfidl.idl.
include/mfidl: Regenerate header from IDL
headers: Add wmsdk.h
headers: Add more constants to STORAGE_BUS_TYPE.
wofutil: new import lib
crt: Regenerate Makefile.in
headers: Add definitions for Compact OS compression.