Bower
A package manager for the web, created at Twitter
Hotel
Start apps from your browser and get local domains without editing /etc/hosts http://i.imgur.com/DrLjbIi.gif
Nock
HTTP mocking and expectations library
Headstart
An automated front-end setup
Broccoli
Browser compilation library – a build tool for applications that run in the browser
Browser Sync
Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Cypress
Fast, easy and reliable testing for anything that runs in a browser.
Shipit
Universal automation and deployment tool written in JavaScript.
Gremlins.js
Monkey testing library for web apps and Node.js
Faker.js
generate massive amounts of fake data in Node.js and the browser