Compass is an open-source CSS Authoring Framework.
Sitespeed.io is an open source tool that helps you analyze and optimize your website speed and performance based on performance best practices. It collects data from multiple pages on your website, analyze the pages using performance best practices rules and output the result as HTML-files or JUnit XML.
Grunt is a task-based command line build tool for JavaScript projects
Background images make pages look good, but also make them slower. Each background image is an extra HTTP request. There's a fix: combine background images into a CSS sprite. But creating sprites is hard, requiring arcane knowledge and lots of trial and error. SpriteMe removes the hassles with the click of a button.
PhantomJS is a headless WebKit with JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG.
Generate beautiful Twitter Bootstrap themes using the Adobe kuler / COLOURlovers color scheme
Twitter's Bootstrap with themes, apps, and other enhancements
The Browser Exploitation Framework (BeEF) is a powerful professional security tool. BeEF is pioneering techniques that provide the experienced penetration tester with practical client side attack vectors. Unlike other security frameworks, BeEF focuses on leveraging browser vulnerabilities to assess the security posture of a target.
Git extensions to provide high-level repository operations for Vincent Driessen's branching model.
A lightweight, pure JavaScript library for responding to CSS media queries.
A system for coordinating the activities of users via their mobile phones.
Mobello is high performance javascript UI framework for HTML5 mobile app
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.
Tips, Resources and Patterns for Responsive Web Design
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.
Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
StyleDocco generates documentation and style guide documents from your stylesheets.
Tool for finding memory leaks in JavaScript programs.