QUnit is a powerful, easy-to-use, JavaScript unit testing framework. It's used by the jQuery project to test its code and plugins but is capable of testing any generic JavaScript code (and even capable of testing JavaScript code on the server-side).

qunit - An easy-to-use JavaScript Unit Testing Framework

Mocha is a feature-rich JavaScript test framework running on node.js and the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. 

Mocha - JavaScript Test Framework

Karma is essentially a tool which spawns a web server that executes source code against test code for each of the browsers connected. The results for each test against each browser are examined and displayed via the command line to the developer such that they can see which browsers and tests passed or failed. It is a simple tool that allows you to execute JavaScript code in multiple real browsers. 

Karma - Spectacular Test Runner for JavaScript

Jasmine is a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. Thus it's suited for websites, Node.js projects, or anywhere that JavaScript can run.

Jasmine - A JavaScript Testing Framework

JSON Server is a full fake REST API with zero coding in less than 30 seconds Created with <3 for front-end developers who need a quick back-end for prototyping and mocking.

json-server - Get a full fake REST API with zero coding in less than 30 seconds

Capybara aims to simplify the process of integration testing Rack applications such as Rails, Sinatra or Merb. Capybara simulates how a real user would interact with a web application. It is agnostic about the driver running your tests and currently comes with Rack::Test and Selenium support built in. HtmlUnit and env.js are supported through external gems. 

Capybara - Acceptance test framework for web applications 

UI Recorder is a zero cost UI test case recorder like Selenium IDE. It support all user operation like key event, mouse event, alert, file upload, drag, svg, shadow dom. It supports mobile native APP, Parallel test, image diff, Screenshots after each step and lot more.

 UI Recorder - UI test case recorder like Selenium IDE

CasperJS is a navigation scripting & testing utility for PhantomJS and SlimerJS (still experimental). It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntactic sugar for doing common tasks such as Filling forms, Clicking links, Capturing screenshots of a page, Downloading resources, even binary ones, Writing functional test suites, exporting results as JUnit XML (xUnit) and lot more.

Casperjs - Navigation scripting and testing utility for PhantomJS and SlimerJS

TestCafe is a pure node.js end-to-end solution for testing web apps. It takes care of all the stages: starting browsers, running tests, gathering test results and generating reports. TestCafe doesn’t need browser plugins - it works in all popular modern browsers out-of-the-box. Run your tests in desktop browsers and headless browsers. Connect to remote testing servers, mobile devices and cloud browser farms.

TestCafe - Automated browser testing for the modern web development stack

Webrat helps to write expressive and robust acceptance tests for a Ruby web application. It supports multiple Ruby web frameworks like Rails, Merb and Sinatra. It also supports popular test frameworks like RSpec, Cucumber, Test::Unit and Shoulda.

Webrat - Ruby Acceptance Testing for Web applications 

Smocker (server mock) is a simple and efficient HTTP mock server. Smocker exposes two ports: Port 8080 is the mock server port. It will expose the routes you register through the configuration port and Port 8081 is the configuration port. It's the port you will use to register new mocks. This port also exposes a user interface.

Smocker - Simple and efficient HTTP mock server

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