Widgetize Navigation Menu WordPress Plugin
Allows you to add any widget to your navigation’s drop-down menus with an easy to use interface. Comes with four custom widgets.
UberMenu – WordPress Mega Menu Plugin
UberMenu is a user-friendly, highly customizable, responsive Mega Menu WordPress plugin. It works out of the box with the WordPress 3 Menu System, making it simple to get started but powerful enough to create highly customized and creative mega menu configurations.