Doxia
· Doxia is a content generation framework that provides powerful techniques for generating static and dynamic content, supporting a variety of markup languages.
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 doxia-2.0.0-M7.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.