Jquery Waypoints
Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element.
Node List.js
NodeList implementation/library - Use the Native DOM APIs as easily as jQuery
Persist State
jQuery Ui widget that will transparently save the state of checkboxes, inputs, selects, etc in localStorage, restoring these on the user's next visit to the page.
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Responsive Comments
A client-side solution to conditional loading.
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Zoom.js
zoom in on any element in the DOM
Phantomjs
Scriptable Headless WebKit
Scrob Master
Master your scroll events.
Vissense
A utility library for observing visibility changes of DOM elements.
Veinjs
Injects CSS into the document (it's a perfectly legal procedure)
Porthole
A proxy to safely communicate to cross-domain iframes in javascript
Fastdom
Eliminates layout thrashing by batching DOM read/write operations
Masonry
Layout elements in a grid, like a mason fitting stones in a wall
Do Mtastic
Small & fast DOM and event library for modern browsers.
Bespoke.js
DIY Presentation Micro-Framework
jQuery Evergreen
Small & fast DOM and event library for modern browsers.