Zeus Notebook is a browser-based Python notebook that provides an AI code assistant named Zeus. The tool enables individuals to run a Python notebook on their browser and interact with Zeus, which helps users with their coding tasks. The user can interact with Zeus by entering Python code and asking questions related to their code. Additionally, the tool offers chat functionality but requires the user to input their OpenAI API key to enable this feature, with the keys being stored locally on the browser. The tool is open source and is developed by Ying Hang Seah with the code available on their GitHub page. Overall, Zeus Notebook is a helpful tool for individuals looking to improve their coding abilities by leveraging an AI code assistant.