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

Protractor is an end-to-end test framework for Angular and AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would. 

Protractor - End to End test framework for Angular apps

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 

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 

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Karma - Spectacular Test Runner for JavaScript

Protractor - End to End test framework for Angular apps

Capybara - Acceptance test framework for web applications

Casperjs - Navigation scripting and testing utility for PhantomJS and SlimerJS

TestCafe - Automated browser testing for the modern web development stack

Webrat - Ruby Acceptance Testing for Web applications

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Projects

Karma - Spectacular Test Runner for JavaScript

Protractor - End to End test framework for Angular apps

Capybara - Acceptance test framework for web applications

Casperjs - Navigation scripting and testing utility for PhantomJS and SlimerJS

TestCafe - Automated browser testing for the modern web development stack

Webrat - Ruby Acceptance Testing for Web applications

TechStack

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