Classic Shell - Classic Shell was developed for Windows 8 since that was the first version of the popular operating system to forgo the iconic Start menu.
Cairo Shell - Cairo is a desktop environment for Windows.
Open Shell - Open Shell is a fork of the Classic Shell project for Windows that getting back the classic start...
WindowBlinds - WindowBlinds is a computer program that allows users to skin the Windows graphical user interface.
StartIsBack - StartIsBack returns Windows 10 and Windows 8 a real fully featured start menu and start button, behaving exactly like the ones in Windows 7. It's totally awesome and easy solution for your new Windows woes.
bug.n - Provide views (i. e. virtual desktops) for showing only those windows, which you need to do your work..