Turn.js
The page flip effect for HTML5
Gif.js
JavaScript GIF encoding library
Alertify.js
JavaScript Alert/Notification System
Rot.js
ROguelike Toolkit
Rivets
Declarative data binding facility
Swig
Take a swig of the best template engine for JavaScript.
Mavo
Create web applications entirely by writing HTML and CSS!
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
jQuery Migrate
APIs and features removed from jQuery core
Vorlonjs
A new, open source, extensible, platform-agnostic tool for remotely debugging and testing your JavaScript. Powered by node.js and socket.io
Spectrum
The No Hassle JavaScript Colorpicker
Alloy Ui
Alloy is a UI metaframework that provides a consistent and simple API for building web applications across allthree levels of the browser: structure, style and behavior.
Bootstrap Wysiwyg
Tiny bootstrap-compatible WISWYG rich text editor
jQuery.maskedinput
jQuery Masked Input Plugin
Layzr.js
A small, fast, modern, and dependency-free library for lazy loading.
Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Stacktrace.js
Framework-agnostic, micro-library for getting stack traces in all web browsers