Featherlight
Featherlight is a very lightweight jQuery lightbox plugin. It's simple yet flexible and easy to use. Featherlight has minimal css and uses no inline styles, everything is name-spaced, it's completely customizable via config object and offers image, ajax and iframe support out of the box. Featherlights small footprint weights about 4kB – in total.
Draggable.js
Make your DOM elements draggable easily
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Ani X
Super easy and lightweight css animation library
Accounting.js
A lightweight JavaScript library for number, money and currency formatting - fully localisable, zero dependencies.
Scrob Master
Master your scroll events.
Comic.js
Cartoon style drawing for HTML5 Canvas & Raphael.js & D3.js & SVG.js
CSS Parent Selector
CSS4 parent selector based on jQuery
Apricot
A simple Hpricot Clone for nodejs.
Apitizer
API mocking for client JavaScript applications
Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Pressure
:point_down::boom: JavaScript library for handling Force Touch, 3D Touch, and Pointer Pressure.
Query Loader2
Version of the QueryLoader by Gaya Design. Preload images with ease.
PhysicsJS
A modular, extendable, and easy-to-use physics engine for javascript
Parsimmon
A monadic LL(infinity) parser combinator library for javascript
Nuclear Js
Reactive Flux built with ImmutableJS data structures. Framework agnostic.
Metrics Graphics
A library optimized for concise, principled data graphics and layouts.