Bower
A package manager for the web, created at Twitter
Stencil
A Web Component compiler for building fast, reusable UI components and Progressive Web Apps 💎 Built by the Ionic Framework team
Browser Sync
Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Chai
BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS
Gremlins.js
Monkey testing library for web apps and Node.js
Ar.js
Image tracking, Location Based AR, Marker tracking. All on the Web.
Hotel
Start apps from your browser and get local domains without editing /etc/hosts http://i.imgur.com/DrLjbIi.gif
Yeoman
Yeoman - a set of tools for automating development workflow
Qunit
An easy-to-use JavaScript Unit Testing framework.
Framer
Modern Prototyping Tool
Holder
Holder renders image placeholders entirely on the client side.
Shipit
Universal automation and deployment tool written in JavaScript.
Intern
A next-generation code testing stack for JavaScript.
Phantom Css
Visual/CSS regression testing with PhantomJS
Broccoli
Browser compilation library – a build tool for applications that run in the browser
Csscomb.js
CSS coding style formatter