Yarn
Fast, reliable, and secure dependency management.
Protractor
E2E test framework for Angular apps
Jquery Mockjax
The jQuery Mockjax Plugin provides a simple and extremely flexible interface for mocking or simulating ajax requests and responses
Csscomb.js
CSS coding style formatter
Gulp
The streaming build system
Headstart
An automated front-end setup
Broccoli
Browser compilation library – a build tool for applications that run in the browser
Quixote
CSS unit testing
Phantom Css
Visual/CSS regression testing with PhantomJS
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS
Nock
HTTP mocking and expectations library
Galen
Layout and functional testing framework for websites
Should.js
BDD style assertions for node.js -- test framework agnostic
Sinon.js
Test spies, stubs and mocks for JavaScript.
Monitor.io
remote monitoring and debugging for socket.io
Logerr
Playing with console errors, experimental project.
JSHint
JSHint is a community-driven tool to detect errors in JavaScript code and enforce your team's coding conventions.