Spa Eye
Backbone debugger for Firefox
Yeoman
Yeoman - a set of tools for automating development workflow
Quixote
CSS unit testing
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.
Framer
Modern Prototyping Tool
Jasmine Ajax
jasmine-ajax - A library for faking Ajax responses in your Jasmine suite.
Gremlins.js
Monkey testing library for web apps and Node.js
Should.js
BDD style assertions for node.js -- test framework agnostic
Pioneer
Integration Testing
Phantom Css
Visual/CSS regression testing with PhantomJS
Gulp
The streaming build system
Headstart
An automated front-end setup
Mimosa
A lightning-fast, modular, next generation browser development tool.
Protractor
E2E test framework for Angular apps
Holder
Holder renders image placeholders entirely on the client side.
Intern
A next-generation code testing stack for JavaScript.
Logerr
Playing with console errors, experimental project.