OpenDAN is an open source Personal AI OS that brings together various AI modules into a single platform for personal use. It offers a range of features and use cases, including workflow automation, package hosting and management, vulnerability detection and fixing, instant development environments, AI-powered code writing and review, code change management, work planning and tracking, collaboration outside of code, and more. OpenDAN aims to provide a comprehensive environment for users to leverage AI technologies for their personal tasks and projects. It emphasizes privacy protection and management, integrated tools for training voice and knowledge models, and an AI Butler Assistant driven by a large language model.