Juffrou
· Juffrou stands for Java Utilities Framework For the Rest Of Us and is a collection of useful classes or mini frameworks to help the java developer.
Checkout the juffrou-reflect module if you are into performant java bean handling. There is also an xml marshaller / unmarshaller which is easy to use and has cool features like the Simplified Marshalling of nested beans.
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-2.1.9.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.