MSYS is described as 'collection of GNU utilities such as bash, make, gawk and grep to allow building of applications and programs which depend on traditionally UNIX tools to be present' and is an app in the OS & Utilities category. There are four alternatives to MSYS for Windows, BSD and Linux. The best alternative is Cygwin, which is both free and Open Source. Other great apps like MSYS are MinGW (Free, Open Source), MSYS2 (Free, Open Source) and MinGW-w64 (Free, Open Source).
Cygwin is a Unix-like environment and command-line interface for Microsoft Windows. Cygwin provides native integration of Windows-based applications, data, and other system resources with applications, software tools, and data of the Unix-like environment.
The project's goal is to deliver runtime, headers, and libs for developing 64 bit (x64), as well as 32 bit (x86), windows applications using gcc-4.4 or newer versions. It can be considered as a folk of MinGW(32)