Yamm is a lightweight and pure CSS megamenu that uses the standard navbar markup and the fluid grid system classes from Bootstrap 3.
Easy Tree is a jQuery plugin that can convert an un-order list to a tree easily with Bootstrap 3 support. Tree items can be selectable, addable, editable and deletable.
A tutorial about creating awesome sidebar navigation with Bootsrap 3 and jQuery.
A lightbox gallery plugin for Bootstrap 3 based on the modal plugin. It supports images, YouTube videos, and galleries.