Roughdraft.js
Quickly create an interactive HTML mock-up by auto sourcing lorem ipsum/images generators, with minimal html markup, and no server side code
Intern
A next-generation code testing stack for JavaScript.
Phantom Css
Visual/CSS regression testing with PhantomJS
Gulp
The streaming build system
Holder
Holder renders image placeholders entirely on the client side.
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS
Jasmine Ajax
jasmine-ajax - A library for faking Ajax responses in your Jasmine suite.
Brjs
BladeRunnerJS (BRJS) is an open source development toolkit and framework for modular construction of large single-page HTML5 apps. It consists of a set of conventions, supporting tools and micro-libraries that make it easy to develop, test, deploy and maintain complex JavaScript apps.
Gremlins.js
Monkey testing library for web apps and Node.js
Blanket
blanket.js is a simple code coverage library for javascript. Designed to be easy to install and use, for both browser and nodejs.
Argon
An open-standards augmented reality platform for the web
Headstart
An automated front-end setup
Browser Sync
Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Mimosa
A lightning-fast, modular, next generation browser development tool.
Ampersand
Quickest way to get started with ampersand.
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.
6to5
Turn ES6 code into readable vanilla ES5 with source maps