Drupalexp Mega menu provides a new menu tree rendering to make responsive, drop-down enabled main menu possible on any theme. The purpose of this module is to give theme developers more simplistic implementation to responsive menus and drop downs without the overhead and not having to worry about overriding default JavaScript, third party libraries (or jQuery update), and CSS
This module takes any existing Drupal menu and produces the markup for a mega menu.
You can see more detail from video as below: