Here are some popular IDEs that are well-suited for Selenium automation testing:

1. Eclipse (for Java):

   • Widely used for Java development, Eclipse supports Selenium through various plugins.
   • It offers a vast array of features like code completion, debugging tools, and a robust plugin ecosystem.

2. IntelliJ IDEA (for Java):

   • Known for its powerful code assistance, refactoring features, and excellent support for web, enterprise, and mobile frameworks.
   • The Community version is free, while the Ultimate version offers additional web and enterprise development features.

3. Visual Studio (for C#):

   • A comprehensive suite for .NET and C# development, Visual Studio provides robust debugging tools, a powerful editor, and integration with Microsoft’s ecosystem.
   • Both free (Community version) and paid versions are available.

4. PyCharm (for Python):

   • Specifically tailored for Python development, PyCharm offers excellent support for web development frameworks and Selenium.
   • It has features like intelligent code editor, debugging support, and seamless git integration. PyCharm also has a community edition.

5. Visual Studio Code (for Java, Python, JavaScript, etc.):

   • A lightweight, open-source, and highly customizable code editor by Microsoft.
   • Supports a wide range of programming languages including Java, Python, and JavaScript through extensions.
   • Provides features like IntelliSense code completion, debugging support, and Git integration.

6. Sublime Text or Atom:

   • These are more general text editors rather than full-fledged IDEs, but they are highly customizable and can be configured for Selenium testing with the right set of plugins.

7. Jupyter Notebook (for Python):

   • Particularly useful for Python scripting, Jupyter Notebook is great for writing and testing Selenium scripts in Python, especially for learning, due to its interactive environment.

8. NetBeans (for Java):

   • A free and open-source IDE, suitable for Java developers. It supports other languages like PHP, JavaScript, and HTML5 as well.