BeanBox is an environment for interactively testing JavaBeans, from SunMicrosystems.

See http://www.javaworld.com/javaworld/jw-09-1997/jw-09-beanbox.html

See also:
* BlueJay -- http://www.bluej.org/about/what.html
* TomatoIDE -- http://tomatoide.sourceforge.net/