DKPro Statistics
· DKPro Statistics is a collection of open-licensed statistical tools, currently including inter-rater agreement, correlation, and significance measures.
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 dkpro-statistics-2.2.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.