Greenfoot is an integrated development environment that makes it easy to write games and simulations in the Java Programming Language. It comes with a broad range of demo scenarios and documentation that gets newcomers started very quickly. Greenfoot may be used to learn or teach programming, or just to put a cool game up on a website. (Yes, Greenfoot can export the game to a web page!) Originally developed for school age learners, but now used by all age groups. Consider greenfoot as a combination between a framework for creating two-dimensional grid assignments in Java and an integrated development environment (class browser, editor, compiler, execution, etc.) suitable for novice programmers. While greenfoot supports the full Java language, it is especially useful for programming exercises that has a visual element. In greenfoot object visualisation and object interaction are the key elements. If you know BlueJ and a microworld framework (like Karel the Robot or the AP Marine Biology Case Study) consider greenfoot as the best from both: object interaction (BlueJ) and object visualisation (microworlds). Downloads available for MacOS and other Java supported platforms at the developer's website. Requires Java Runtime Environment. Get It Here.