I know there are a lot of start menu programs available for Windows 8 but ViStart deserves a mention here on Winmatrix.
ViStart is one of the oldest start menu program. The application was made by lee-soft especially for Windows XP users to bring Windows 7 style start menu to Windows XP.
It can now be used on Windows 8. The latest version of ViStart 8.1 is compatible with Windows 8, Windows 7, Vista and XP.
So how it is better than all the other start menus for Windows 8? Well, there are a lot of custom skins. You can make the start menu flat to match Windows 8 theme, or apply a metro skin, or bring the old XP, Vista or Windows 7 style start menu,