As of my last update in September 2021, there were several popular and effective automation tools for software testing. However, please note that the landscape of software testing tools is continually evolving, so it's recommended to check for the latest options. Here are some of the best automation tools for software testing that were widely used:

Selenium: Selenium is a widely adopted open-source tool for automating web browsers. It supports various programming languages like Java, C#, Python, etc., and allows testers to write test scripts to interact with web applications across different browsers.

Appium: Appium is an open-source mobile application automation tool that supports both Android and iOS platforms. It enables testers to automate mobile app testing using native, hybrid, and mobile web applications. software testing course in pune

TestComplete: TestComplete is a powerful commercial automation tool that supports automated testing of web, desktop, and mobile applications. It offers record and playback, as well as scripting capabilities using languages like JavaScript, Python, or VBScript.

JUnit and TestNG: These are popular testing frameworks for Java that allow developers to perform unit testing on Java code. They are widely used in Continuous Integration and Continuous Deployment (CI/CD) pipelines.

JIRA: While not a dedicated testing tool, JIRA is a popular issue and project tracking software widely used for test management and bug tracking. It is often integrated with other testing tools to manage test cases and track defects.

Cucumber: Cucumber is a behavior-driven development (BDD) tool that supports collaboration between business stakeholders and development teams. It uses a plain-text format for specifying test scenarios, making it easier to understand by non-technical stakeholders.
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Postman: Postman is an API testing tool that simplifies the process of testing RESTful APIs. It allows testers to create and execute API requests and automate API testing.

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Ranorex: Ranorex is a commercial automation tool that supports web, desktop, and mobile application testing. It offers a user-friendly GUI for test automation and supports various programming languages.

Cypress: Cypress is a relatively new open-source test automation tool specifically designed for web applications. It provides fast, reliable, and easy-to-write tests for modern web development frameworks.

Robot Framework: Robot Framework is an open-source test automation framework that uses a keyword-driven approach and supports both web and mobile application testing. It is easy to learn and supports various external libraries and integrations.

Remember, the best automation tool for your software testing needs depends on factors like the nature of your application, the technology stack used, your team's expertise, and your specific testing requirements.