Nested

Kwicks is a jQuery plugin providing sexy sliding panels with an emphasis on navigational interaction. Kwicks was originally a port of a MooTools effect (of the same name), but has since evolved into a highly configurable and versatile UI component.   

jQuery Sortable is a flexible, opinionated sorting plugin. It enables items in a list (or table etc.) to be sorted horizontally and vertically using the mouse. Supports nested lists and pure drag/drop containers.   jQuery Sortable does not depend on jQuery UI and works well with Twitter's Bootstrap (You can even sort the Bootstrap navigation).