Roughdraft.js
Quickly create an interactive HTML mock-up by auto sourcing lorem ipsum/images generators, with minimal html markup, and no server side code
Angular Debaser
Just a better way to test AngularJS apps.
Nightwatch
UI automated testing framework based on node.js and selenium webdriver
Trace Kit
Attempts to create stack traces for unhandled JavaScript exceptions in all major browsers.
Js Cover
JSCover is a tool that measures code coverage for JavaScript programs.
Nock
HTTP mocking and expectations library
Phantom Css
Visual/CSS regression testing with PhantomJS
Fast Check
Property based testing framework for JavaScript (like QuickCheck) written in TypeScript
Jasmine
DOM-less simple JavaScript testing framework
Pioneer
Integration Testing
Gulp
The streaming build system
Bower
A package manager for the web, created at Twitter
Qunit
An easy-to-use JavaScript Unit Testing framework.
Stacktrace.js
Framework-agnostic, micro-library for getting stack traces in all web browsers
Csscritic
A lightweight framework for regression testing of Cascading Style Sheets
Prettydiff
Compare code instead of text.
Headstart
An automated front-end setup