clutch
· Clutch is a service registry and discovery component, that provides an infrastructure to publish and discover various resources, such as service proxies, HTTP endpoints, data sources.
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 clutch-1.2.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.