jalarms
· A simple to use alarm system for Java server applications. With jAlarms you can notify different users through different means about certain events in your application, so they can receive notice via email, MSN, SMS, Twitter, etc.
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 jalarms-1.5.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.