Juffrou
· Juffrou stands for Java Utilities Framework For the Rest Of Us and is a collection of extremely useful classes or mini frameworks to help the java developer.
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 juffrou-1.0.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.