Quickly check how well 3rd party script behaves.
Yeoman - a set of tools for automating development workflow
Bring console.log on the screen
Fast, reliable, and secure dependency management.
generate massive amounts of fake data in Node.js and the browser
E2E test framework for Angular apps
BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.
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.
Start apps from your browser and get local domains without editing /etc/hosts http://i.imgur.com/DrLjbIi.gif
Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Browser compilation library – a build tool for applications that run in the browser
A package manager for the web, created at Twitter