OpenWayback
· OpenWayback is the open source project behind the Wayback Machine, and is supported by the members of the International Internet Preservation Consortium (IIPC).
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 openwayback-2.4.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.