OSHDB toolkit
· This is a toolkit that holds plug-in-like executable tools and their background. They are not directly a cornerstone of the core but hold some interesting tools you might want to check out!
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 oshdb-tool-0.5.11.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.