Contextual.js is a vanilla JS plugin that attaches a dynamic, customizable, multi-level context/pop-up menu to your element. Without any dependencies.
An awesome navigation system that expands the hamburger toggle button into a horizontal navigation bar using CSS3 transitions and transforms.
Omega.js uses CSS media queries to detect the screen size and collapse the regular navbar into a hamburger sidebar navigation (aka. off-canvas navigation).
A project contains 5 off-canvas hamburger navigation variations from which you can choose to bring the native app navigation experience to your webpage.