Rulers Guides.js
Creates Photoshop-like guides and rulers interface on a web page
Nightwatch
UI automated testing framework based on node.js and selenium webdriver
Js Cover
JSCover is a tool that measures code coverage for JavaScript programs.
Yeoman
Yeoman - a set of tools for automating development workflow
Csscomb.js
CSS coding style formatter
Blaver
A JavaScript library built on top of the Faker.JS library. It generates massive amounts of fake data in the browser and node.js.
Jasmine
DOM-less simple JavaScript testing framework
Bluebird
Bluebird is a full featured promise library with unmatched performance.
Angular Debaser
Just a better way to test AngularJS apps.
Qunit
An easy-to-use JavaScript Unit Testing framework.
Gulp
The streaming build system
Trace Kit
Attempts to create stack traces for unhandled JavaScript exceptions in all major browsers.
Protractor
E2E test framework for Angular apps
Spa Eye
Backbone debugger for Firefox
Fast Check
Property based testing framework for JavaScript (like QuickCheck) written in TypeScript
Stacktrace.js
Framework-agnostic, micro-library for getting stack traces in all web browsers
Grunt
Grunt: The JavaScript Task Runner