1. Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.

  2. TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.

  3. Test your website for cross browser compatibility on real browsers. Instant access to multiple desktop and mobile browsers. Get Free Trial.

  4. Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.

  5. SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.

  6. Free cross browser compatibility testing tool online to test on 2000+ desktop and mobile browsers. Get online virtual access to machines running real browsers and real operating systems on cloud.

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  7. iMacros allow you to record the most tedious and common actions you take on your browser and automate them to simplify the routine of your life.

  8. CasperJS is a browser navigation scripting & testing utility written in Javascript for PhantomJS or SlimerJS.

  9. Built on the top of Selenium and Appium, Katalon Studio is a free and powerful automated testing tool for web testing, mobile testing, and API testing.

  10. PhantomJS is a headless browser that works hand in hand with Selenium to help developers more efficiently test their sites and apps.

  11. Oracle Application Testing Suite is a comprehensive, integrated testing solution for web applications and services.

  12. Appium is an open source test automation framework for use with native and hybrid mobile apps.