amd4j
· A command line tool for running JavaScript scripts that
use the Asychronous Module Defintion API (AMD) for declaring and
using JavaScript modules and regular JavaScript script files.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window amd4j-0.2.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.