Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.

DropzoneJS is an open source library that provides drag'n'drop file uploads with image previews.

Javascript forms validation.
Powerful, UX aware & Dead simple.

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succint API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL). Designed as a drop in alternative to PHPUnit's phpunit-mock-objects library, Mockery is easy to integrate with PHPUnit and can operate alongside phpunit-mock-objects without the World ending.

Ender is a full featured package manager for your browser.
It allows you to search, install, manage, and compile front-end JavaScript packages and their dependencies for the web. We like to think of it as npm's little sister.

Ender is not a JavaScript library.
It's not a jQuery replacement. It's not even a static asset. It's a tool for making the consumption of front-end JavaScript packages dead simple and incredibly powerful.

Peer-to-peer data in the web browser.
PeerJS completes WebRTC as an API abstraction, connection broker, and binary serialization format

A project which offers the same Todo application implemented using MV concepts in most of the popular JavaScript MV frameworks of today.

A lightweight library that provides tools for organizing asynchronous code

A lightweight, pure JavaScript library for responding to CSS media queries.

Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API. If you use jQuery, you already know how to use Zepto.

JavaScript Game Engine, HTML5 Game Engine

RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node.

Namespace.js is a small javascript script which provide namespacing utilities. It is framework independent. It also allows you to remotely include files.

A Python Mocking and Patching Library for Testing

dancer.js is a high-level audio API, usable with both Mozilla's Audio Data API and Webkit's Web Audio API with flash fallback, designed to make sweet visualizations.

A simple library for handling keyboard shortcuts in Javascript.

Rainbow is a code syntax highlighting library written in Javascript.
It was designed to be lightweight (1.4kb), easy to use, and extendable.
It is completely themable via CSS.

In few words, Given a html document, it pulls out the main body text and cleans it up. It also can clean up title based on latest readability.js code.

Command-line interface description language. docopt helps you define interface for your command-line app, and automatically generate parser for it.

Superheroic JavaScript MVC Framework