The Ultimate WordPress Menu Pro is a WordPress plugin, where you can easily add widgets in a single or multiple group wise. You can assign specific column to specific group if you selected multiple type group for mega menu.  

Fully Responsive
Mega or Flyout Submenus
Compatible with Mobile devices, including iPhone, iPad, and Android
Touch-enabled
Build advanced submenu layouts with the built in column grid system
Easy to use

Rapidly develop Mega Menus from your pages, posts, custom links, or any content!
Works out of the box with most WordPress 3 Menu-Enabled Themes
Integrates directly with the WordPress 3 Menu Management System – work with the system that you know and love!
Fully Configurable

Dropdown CSS3 Transitions Shift Up, Slide Down, Fade, or None
Trigger Hover, Hover Intent, or Click
Includes 25 popular Google Fonts
Vertical or Horizontal menus
Multiple UberMenus can be configured independently
Responsive & Mobile

Responsive layout
Configurable Breakpoint
Tabbed SubmenusEasy to CustomizeAdvanced ContentDynamic ItemsAdvanced Submenu Layouts

AND MUCH MORE!