UsefulThings
· UsefulThings is a all in one library that contains AppRater, ChangeLog, UpdateChecker, ActivityAnimator, CircularImageView, TouchImageView
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 usefulthings-library-3.0.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.