MinGW-w64 – for 32 and 64 bit Windows, A complete runtime environment for gcc
mingw-w64 – GCC for Windows 64 & 32 bits
Win-builds – (Free) Software Building and Packaging For Windows
MSYS2
MSYS2 installer
MSYS2 for Qt
How to build your GTK+ application on Windows
Compile and Install OpenWalnut with MSYS2
Getting and Setting up Msys2, Compiling and Running LibSwift and the Tutorial
Getting and Setting up Msys2, Compiling and Running LibSwift and the Tutorial
Package scripts for MinGW-w64 targets to build under MSYS2
Re: GTK-3.0 for Windows64 update – msg#00020
Pure MSYS2 Unix-like build on Windows: Packaging