BlueJ is an integrated development environment (IDE) for the Java programming language. Developed by Michael Kölling
License: Open Source
MonoDevelop is a powerful, cross-platform IDE primarily focused on .NET development, offering extensive features and language support, making it suitable for professional developers. In contrast, BlueJ is a lightweight, educational IDE specifically designed for Java, catering to beginners and academic environments, but lacks the advanced capabilities needed for larger projects.