jQuery Tree Multiselect is a jQuery plugin that allows you to replace a
select element with a treeview element. It's a multiple select with nested options.
Flaunt.js is a jQuery script that allows you to create a responsive, nested navigation out the box.
Flaunt was built to overcome responsive design challenges which faced a huge percentage of websites. This challenge was to show nested navigation items on click-demand, without the event taking you through to the page you've pressed.
A simple accordion that allows for a nested structure. The style comes with some examples of how to style three levels and how to add a media query for decreasing the size on smaller screens. Clicking a trigger element will open the content.
Nested is a jQuery plugin to create a gap free, multi column grid layouts. Nested plugin also sports a responsive design.