At its core 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. It provides a bash shell, Autotools, revision control systems and the like for building native Windows applications using MinGW-w64 toolchains.
It features a package management system to provide easy installation of packages, Pacman. It brings many powerful features such as dependency resolution and simple complete system upgrades, as well as straight-forward package building. (Source: Homepage)
Download MSYS2Portable 2017.09.18 Dev Test 1 English [41.5MB download / 217.9MB installed]
2017.09.18 Dev Test 1 (2018-01-16): Update base app + set working directory
2016.10.25 Dev Test 1 (2017-05-18): Initial release