As you can see, Classic Shell is a great program that allows you to add the Start Menu back to Windows 8 without losing any functionality.

When using Classic Shell and CSMenu, you can instantly switch back to the default Windows 7 Start menu by clicking the "Start" button while holding down the "Shift" key.

Open Shell, originally known as Classic Shell, is open-source software that allows you to replace the standard Start Menu on Windows 10 and Windows 8.

Windows only: Start menu replacement utility Classic Shell adds back some of the missing features in Windows 7 or Vista that used to exist in XP—like the Classic-style Start Menu.