Beigesoft UML editor
· Graphic editor for UML 2.4.1 compliant class diagram, package diagram, object diagram,
sequence diagram and use case diagram. Also, it is a doclet that can generates Javadoc with UML class diagrams.
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 beige-uml-2.1.11.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.