robot
· ROBOT is an OBO Tool: A library and command-line tool for working with OWL ontologies, especially Open Biological and Biomedical Ontologes (OBO).
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 robot-1.9.4.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.