This framework is targeted directly and only towards Windows development. The only other noteworthy Windows framework is MFC, which is pretty ancient and painful to use. There are of course the big cross platform frameworks, like wxWidgets and Qt. But for smaller projects, it is sometimes desirable to work on a smaller framework, with a correspondingly smaller footprint. Different tools for different tasks, so speak.
neoWidgets is designed to be that tool. It also supports C++11 heavily, so all the good stuff like move construction and lambdas are possible.