Cairo Shell - Cairo is a desktop environment for Windows.
WindowBlinds - WindowBlinds is a computer program that allows users to skin the Windows graphical user interface.
BB4Win - BB4Win (Blackbox for Windows) is an alternative shell for Microsoft Windows.
bbLean - Alternative Windows shell
bug.n - Provide views (i. e. virtual desktops) for showing only those windows, which you need to do your work..
SkinPacks Flattastic Theme - SkinPacks Flattastic Theme is a powerful software designed for the windows system that allows users to change the skin of the window without facing any hassle.