AI chat in the Visual Studio Code side bar. Rubberduck can generate code, edit code, explain code, generate tests, find bugs, diagnose errors, and more. You can even add your own conversation templates.
This VS Code extension is incredibly user-friendly and provides a range of powerful coding features. The ability to edit code using AI and view the resulting differences is a game-changer. Simply select the code you want to modify, provide a prompt (such as "please refactor this into two functions"), and observe the resulting changes. In my opinion, it's a significant improvement over Codex, and it's also open-source.
More than ChatGPT, it's optimized for development with custom actions such as "Edit Code" that provide you with a diff you can refine. Also, you can create your own custom prompts and that's cool.
