BeanShell is a great tool for Java programmers which allows you to type Java at a command line and have it evaluated immediately, just like languages such as Python.
BeanShell is distributed as a Java .jar file, and while it is pretty easy to run these on a Mac (just double-click), its a bit untidy as they have a generic icon, and tools like LaunchBar don’t recognize them as a proper application.
To remidy this I’ve packaged up BeanShell as a proper Mac application, you can download the result here:
Download: BeanShell.app 2.0b4
NOTE: I didn’t create BeanShell, I’ve just packaged it. To learn more about BeanShell, or to download its source code visit http://beanshell.org/.