Apitizer
API mocking for client JavaScript applications
Should.js
BDD style assertions for node.js -- test framework agnostic
Intern
A next-generation code testing stack for JavaScript.
Jasmine Ajax
jasmine-ajax - A library for faking Ajax responses in your Jasmine suite.
Quixote
CSS unit testing
Ampersand
Quickest way to get started with ampersand.
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS
Mimosa
A lightning-fast, modular, next generation browser development tool.
Prettydiff
Compare code instead of text.
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
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.
Argon
An open-standards augmented reality platform for the web
Screenlog.js
Bring console.log on the screen
Broccoli
Browser compilation library – a build tool for applications that run in the browser
Vorlonjs
A new, open source, extensible, platform-agnostic tool for remotely debugging and testing your JavaScript. Powered by node.js and socket.io
Pioneer
Integration Testing
Hotel
Start apps from your browser and get local domains without editing /etc/hosts http://i.imgur.com/DrLjbIi.gif