Customizable WP navigation plugin is from Grooni who developed Crane theme. You will get a kick out of Megamenu extension as you can set and create different types of a menu on your website. Easy customizable presets from header library. Change colors, sizes, fonts, icons, backgrounds, animation. Contains external links.

To install:
1. Upload the folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress