Superfly Responsive Menu (superfly-menu) WordPress plugin

Superfly, a responsive WordPress plugin generates space-efficient vertical push/sliding/static navigation, icon toolbar and fullscreen menus of your choice.

You can use it as standalone navigation, or complement your main menu. Superfly makes navigation easy and intuitive on both desktops and smartphones. The slide-in vertical menu concept that was successful on mobiles is now a success on desktops! It can also be used for always-visible navigation.