"Superfly — Responsive WordPress Menu Plugin!
Superfly 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 plugin 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...!"