Scripts and plugins.
If your computer is connected to the Internet, JEB's startup script will download those dependencies automatically.
Else, you will need to download SWT and Jython packages of your choosing:
SWT. Required by the GUI. Download the version that matches your system, and drop the JAR in the JEB directory. If you wish to install a different SWT package, it must be renamed to "swt.jar".
Jython (multi-platform). Required for Python scripts and plugins. The standalone package is recommended (as it contains many important Python libraries in "Lib/".) The non-standalone packages are to be used only if Jython is already installed on your system. The Jython JAR is to be dropped in the JEB directory. If you wish to install a different Jython package, it must be renamed to "jython.jar".