BlueJ

BlueJ provides a graphical Java development environment aimed at learners who are new to programming. It offers a visual interface for creating classes, objects, and method calls, allowing users to experiment with code execution step‑by‑step. The tool integrates a compiler and runtime based on Java/JavaFX 21, and runs on 64‑bit Windows, macOS, and Ubuntu/Debian systems, with support for Intel and ARM64 processors.

The environment is distributed as free software under the GNU GPL 2 with the Classpath Exception, and its source code is hosted on GitHub. Educational resources accompany the IDE, including a textbook co‑authored by its developers, a teacher‑focused website offering lesson plans and community interaction, and a set of tutorials and reference materials. Extensions are available to augment the core functionality, and technical support is provided through a FAQ, bug tracker, and direct contact channels.

BlueJ is widely used in introductory programming courses and by self‑learners worldwide, with millions of installations reported. Its design emphasizes simplicity and visual feedback to help beginners grasp object‑oriented concepts before moving to more complex development tools.