redpen
· RedPen is an open source proofreading tool a tool to check if your technical documents meet the writing standard . RedPen supports various markup text formats (Markdown, Textile, AsciiDoc, and LaTeX).
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 redpen-1.10.3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.