MSYS2 is software distribution and a building platform for Windows. It provides a Unix-like environment, a command-line interface and a software repository making it easier to install, use, build and port software on Windows. That means Bash, Autotools, Make, Git, GCC, GDB..., all easily installable through Pacman, a fully-featured package manager.

At its core, it is an independent rewrite of MSYS, based on modern Cygwin (POSIX compatibility layer) and MinGW-w64 with the aim of better interoperability with native Windows software.