Superfly is a responsive WordPress menu plugin that generates space efficient vertical push/sliding/static navigation, icon toolbar or fullscreen menu on your choice. It can be used as standalone navigation or compliment your main menu. Superfly makes navigation much easier and user-friendly both on desktops and mobiles. Concept of slide in vertical menu that proved itself on mobiles now shines on desktops too! It can be used as always visible navigation as well.

Demo: https://codecanyon.net/item/superfly-responsive-wordpress-menu-plugin/8012790