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Automated testing increases the overall efficiency of software development by reducing manual effort and saving the time spent on repetitive tasks. The software industry as a whole is being transformed by web automation testing. Web automation testing is achieved through a proper testing tool that can generate customizable and reusable test scripts. The five most popular open-source test automation tools are Selenium, Appium, Lambda and Selenium. The selection of appropriate tools depends on the following factors: Open-source support various operating systems and browsers.