volo - Create front end projects from templates, add dependencies, and automate the resulting projects.
Duo - Next-generation package manager that blends the best ideas from Component, Browserify and Go to make organizing and writing front-end code quick and painless.
yarn - Fast, reliable, and secure dependency management.
Loaders
Module or loading system for JavaScript.
RequireJS - A file and module loader for JavaScript.
browserify - Browser-side require() the node.js way.
xtemplate - eXtensible Template Engine lib for node and the browser
marko - A fast, lightweight, HTML-based templating engine for Node.js and the browser with async, streaming, custom tags and CommonJS modules as compiled output.
swig - A simple, powerful, and extendable Node.js and browser-based JavaScript template engine.
EpicEditor - An embeddable JavaScript Markdown editor with split fullscreen editing, live previewing, automatic draft saving, offline support, and more.
jsoneditor - A web-based tool to view, edit and format JSON.
vim.js - JavaScript port of Vim with a persistent ~/.vimrc
wysihtml5 - Open source rich text editor based on HTML5 and the progressive-enhancement approach. Uses a sophisticated security concept and aims to generate fully valid HTML5 markup by preventing unmaintainable tag soups and inline styles.
raptor-editor - Raptor, an HTML5 WYSIWYG content editor!
popline - Popline is an HTML5 Rich-Text-Editor Toolbar
Documentation
DevDocs is an all-in-one API documentation reader with a fast, organized, and consistent interface.
dexy is a free-form literate documentation tool for writing any kind of technical document incorporating code.
docco is a quick-and-dirty, hundred-line-long, literate-programming-style documentation generator.
styledocco generates documentation and style guide documents from your stylesheets.
Ronn builds manuals. It converts simple, human readable textfiles to roff for terminal display, and also to HTML for the web.
dox is a JavaScript documentation generator written with node. Dox no longer generates an opinionated structure or style for your docs, it simply gives you a JSON representation, allowing you to use markdown and JSDoc-style tags.
jsdox is a JSDoc3 to Markdown documentation generator.
YUIDoc is a Node.js application that generates API documentation from comments in source, using a syntax similar to tools like Javadoc and Doxygen.
coddoc is a jsdoc parsing library. Coddoc is different in that it is easily extensible by allowing users to add tag and code parsers through the use of coddoc.addTagHandler and coddoc.addCodeHandler. coddoc also parses source code to be used in APIs.
sphinx a tool that makes it easy to create intelligent and beautiful documentation
Beautiful docs is a documentation viewer based on markdown files.
documentation.js - API documentation generator with support for ES2015+ and flow annotation.
jsduck - API documentation generator made for Sencha JavaScript frameworks, but can be used for other frameworks too.
Files
Libraries for working with files.
Papa Parse - A powerful CSV library that supports parsing CSV files/strings and also exporting to CSV.
jBinary - High-level I/O (loading, parsing, manipulating, serializing, saving) for binary files with declarative syntax for describing file types and data structures.
diff2html - Git diff output parser and pretty HTML generator.
Bacon - FRP (functional reactive programming) library for Javascript.
Kefir - FRP library for JavaScript inspired by Bacon.js and RxJS with focus on high performance and low memory consumption.
[Highland] (http://highlandjs.org/) - Re-thinking the JavaScript utility belt, Highland manages synchronous and asynchronous code easily, using nothing more than standard JavaScript and Node-like Streams.
url-pattern - Easier than regex string matching patterns for urls and other strings. Turn strings into data or data into strings
Number
Numeral-js - A javascript library for formatting and manipulating numbers.
chance.js - Random generator helper in Javascript. Can generate numbers, strings etc.
odometer - Smoothly transitions numbers with ease.
accounting.js - A lightweight JavaScript library for number, money and currency formatting - fully localisable, zero dependencies.
money.js - A tiny (1kb) javascript currency conversion library, for web & nodeJS.
Fraction.js - A rational number library for JavaScript
Complex.js - A complex number library for JavaScript
Polynomial.js - A polynomials library for JavaScript
Storage
store.js - LocalStorage wrapper for all browsers without using cookies or flash. Uses localStorage, globalStorage, and userData behavior under the hood.
localForage - Offline storage, improved. Wraps IndexedDB, WebSQL, or localStorage using a simple but powerful API.
jStorage - jStorage is a simple key/value database to store data on browser side.
cross-storage - Cross domain local storage, with permissions.
basket.js - A script and resource loader for caching & loading scripts with localStorage.
bag.js - A caching script and resource loader, similar to basket.js, but with additional k/v interface and localStorage / websql / indexedDB support.
basil.js - The missing Javascript smart persistent layer.
jquery-cookie - A simple, lightweight jQuery plugin for reading, writing and deleting cookies.
js-cookie - A simple, lightweight JavaScript API for handling browser cookies
Cookies - JavaScript Client-Side Cookie Manipulation Library.
q - A tool for making and composing asynchronous promises in JavaScript.
step - An async control-flow library that makes stepping through logic easy.
contra - Asynchronous flow control with a functional taste to it.
Bluebird - fully featured promise library with focus on innovative features and performance.
when - A solid, fast Promises/A+ and when() implementation, plus other async goodies.
ObjectEventTarget - Provide a prototype that add support to event listeners (with same behavior of EventTarget from DOMElements available on browsers).
Routing
director - A tiny and isomorphic URL router for JavaScript.
page.js - Micro client-side router inspired by the Express router (~1200 bytes).
pathjs - Simple, lightweight routing for web browsers.
Conzole - A debug panel built in javascript that wraps javascript native console object methods and functionality in a panel displayed inside the page.
sly - JavaScript library for one-directional scrolling with item based navigation support.
vegas - A jQuery plugin to add beautiful fullscreen backgrounds to your webpages. It even allows Slideshows.
Sequence - CSS animation framework for creating responsive sliders, presentations, banners, and other step-based applications.
reveal.js - A framework for easily creating beautiful presentations using HTML.
impress.js - It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com.
pickadate.js - The mobile-friendly, responsive, and lightweight jQuery date & time input picker.
bootstrap-datepicker - A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode.
Pikaday - A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS.
fullcalendar - Full-sized drag & drop event calendar (jQuery plugin).
rome - A customizable date (and time) picker. Dependency free, opt-in UI.
datedropper - datedropper is a jQuery plugin that provides a quick and easy way to manage dates for input fields.
Select
selectize.js - Selectize is the hybrid of a textbox and select box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
select2 - a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
chosen - A library for making long, unwieldy select boxes more friendly.
File Uploader
jQuery-File-Upload - File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery.
dropzone - Dropzone is an easy to use drag'n'drop library. It supports image previews and shows nice progress bars.
flow.js - A JavaScript library providing multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API.
FileAPI - A set of javascript tools for working with files. Multiupload, drag'n'drop and chunked file upload. Images: crop, resize and auto orientation by EXIF.
plupload - A JavaScript API for dealing with file uploads it supports features like multiple file selection, file type filtering, request chunking, client side image scaling and it uses different runtimes to achieve this such as HTML 5, Silverlight and Flash.
jparallax - jQuery plugin for creating interactive parallax effect.
fullPage - A simple and easy to use plugin to create fullscreen scrolling websites (also known as single page websites).
ScrollMenu - A new interface to replace old boring scrollbar.
Clusterize.js - Tiny vanilla JS plugin to display large data sets easily.
Menu
jQuery-menu-aim - jQuery plugin to fire events when user's cursor aims at particular dropdown menu items. For making responsive mega dropdowns like Amazon's.
Slideout - A responsive touch slideout navigation menu for mobile web apps.
Slide and swipe - A sliding swipe menu that works with touchSwipe library.
Table/Grid
jTable - A jQuery plugin to create AJAX based CRUD tables.
DataTables - (jQuery plug-in) It is a highly flexible tool, based upon the foundations of progressive enhancement, and will add advanced interaction controls to any HTML table.
floatThead - (jQuery plug-in) lock any table's header while scrolling within the body. Works on any table and requires no custom html or css.
Semantic UI - UI Kit with lots of themes and elements
w2ui - A set of jQuery plugins for front-end development of data-driven web applications.
fluidity - The worlds smallest fully-responsive css framework
Ink - An HTML5/CSS3 framework used at SAPO for fast and efficient website design and prototyping
Boilerplates
html5-boilerplate - A professional front-end template for building fast, robust, and adaptable web apps or sites.
mobile-boilerplate - A front-end template that helps you build fast, modern mobile web apps.
webplate - An awesome front-end framework that lets you stay focused on building your site or app while remaining really easy to use.
Cerberus - A few simple, but solid patterns for responsive HTML emails. Even in Outlook.
full-page-intro-and-navigation - An intro page with a full width background image, a bold animated menu and an iOS-like blurred effect behind the navigation
OpenLayers3 - A high-performance, feature-packed library for all your mapping needs.
Video/Audio
prettyembed.js - Prettier embeds for your YouTubes - with nice options like high-res preview images, advanced customization of embed options, and optional FitVids support.
Play-em JS - Play'em is a javascript component that manages a music/video track queue and plays a sequence of songs by embedding several players in a HTML DIV including Youtube, Soundcloud and Vimeo.
polyplayer - Rule YouTube, Soundcloud and Vimeo player with one API
mediaelement - HTML5 or player with Flash and Silverlight shims that mimics the HTML5 MediaElement API, enabling a consistent UI in all browsers. http://mediaelementjs.com/
SoundJS - A library to make working with audio on the web easier. It provides a consistent API for playing audio in different browsers.
video.js - Video.js - open source HTML5 & Flash video player
FitVids.js - A lightweight, easy-to-use jQuery plugin for fluid width video embeds.
list.js - Adds search, sort, filters and flexibility to tables, lists and various HTML elements. Built to be invisible and work on existing HTML.
http://www.listjs.com
Superhero.js - A collection of resources about creating, testing and maintaining a large JavaScript code base.
SJSJ - Simplified JavaScript Jargon is a community-driven attempt at explaining the loads of buzzwords making the current JavaScript ecosystem in a few simple words.