Cavaj Java Decompiler 

Cavaj Java Decompiler is a graphical freeware utility that reconstructs java source code from CLASS files. You can decompile java applets, jar and zip files producing accurate java source code.
java decompiler decompile class file reverse engineer disassembler source recover decafe binary jar

JCavaj Java Decompiler 

JCavaj Java Decompiler is a free Java-based Java Decompiler. It reconstructs the original source code from a compiled binary class file. You can decompile java applets, jar and zip files producing accurate java source code.
jcavaj java decompiler decompile class file reverse engineer disassembler source recover decafe binary