BlueJ is an integrated development environment (IDE) specifically designed for educational purposes, particularly for teaching the Java programming language. It provides a simple and intuitive user interface designed to help beginners learn the basics of object-oriented programming without being overwhelmed by the complexity of larger IDEs. BlueJ offers features like an interactive class structure display, straightforward project management, and integrated editor, code inspection, and visualization tools geared towards helping users understand the fundamentals of Java coding. Additional educational tools include textual and graphical debugging, as well as the ability to interact with Java objects. BlueJ is developed and maintained by a team at King's College London, with its latest version and resources available at https://bluej.org/. This platform is widely used in academic settings around the world and supports various platforms including Windows, macOS, and Linux.