Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Twitterlib
Twitter JavaScript API library
URI.js
Javascript URL mutation library
Use.js
An AMD/RequireJS plugin for consuming incompatible JavaScript files.
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).
Jquery Waypoints
Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element.
Webfontloader
WebFont Loader gives you added control when using linked fonts via @font-face.
Head js
The only script in your HEAD. Head JS loads JavaScript files in parallel like images without blocking the page. Your page will be faster. Even with a single combined file.
Hashgrid
A little tool that inserts a layout grid in web pages, allows you to hold it in place, and toggle between displaying it in the foreground or background.
Xregexp
Extended JavaScript regular expressions
Xui
A tiny javascript framework for mobile web apps.
Yepnope.js
An Asynchronous Conditional Resource Loader
Zepto
Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API
Zxcvbn
zxcvbn, named after a crappy password, is a JavaScript password strength estimation library. Use it to implement a custom strength bar on a signup form near you!
Handlebars.js
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration. An extension to the Mustache templating language created by Chris Wanstrath.
G.raphael
gRaphaël’s goal is to help you create stunning charts on your website. It is based on Raphaël graphics library.
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.