Stacktrace.js
Framework-agnostic, micro-library for getting stack traces in all web browsers
Hotel
Start apps from your browser and get local domains without editing /etc/hosts http://i.imgur.com/DrLjbIi.gif
Bower
A package manager for the web, created at Twitter
Nock
HTTP mocking and expectations library
Shipit
Universal automation and deployment tool written in JavaScript.
Type Script
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Gremlins.js
Monkey testing library for web apps and Node.js
Cypress
Fast, easy and reliable testing for anything that runs in a browser.
6to5
Turn ES6 code into readable vanilla ES5 with source maps
Faker.js
generate massive amounts of fake data in Node.js and the browser