Jad
The fast Java decompiler. Separate versions for Win32, OS/2, most Unixen. Large choice of command-line and GUI front-ends available. [Free for non-commercial]
url: kpdus.tripod.com/jad.html
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CafeBabe
Graphical disassembler and editor of Java bytecodes. [Open Source] Note: download at parent page.
url: www.geocities.com/CapeCanaveral/Hall/2334/Programs...
Cavaj Java Decompiler
A freeware utility that reconstructs java source code from CLASS files. You can browse the reconstructed source code with the Class View for instant access to methods and fields. It uses Jad as its Java decompiling engine. [Freeware]
url: www.bysoft.se/sureshot/cavaj/
ClassCracker
Visual Java decompiler from Mayon Software Research. [Commercial]
url: www.pcug.org.au/~mayon/
ClassSpy
GUI class analyser and decompiler. Also provides a simple obfuscator. [Freeware]
url: www.psychoticsoftware.com/Products/ClassSpy/
Decafe Pro
Java Decompiler for Win32 platform. [Commercial]
url: decafe.hypermart.net/
dis
A functional, fast and simple disassembler that is written in C. Like javap, produces bytecode. Download Solaris, Win95/NT versions. Mac or other Unixen or source code by email request. [Freeware]
url: www.cs.princeton.edu/~benjasik/dis/index.html
JADO (Java Decompiler And Obfuscator)
A decompiler for Java which is platform independent and has options to obfuscate the class file also. [Open source, Public Domain]
url: sourceforge.net/projects/dcompiler
JCavaj
A free Java-based Java Decompiler. It uses Jode as its Java decompiling engine. [Open source, GPL]
url: www.bysoft.se/sureshot/jcavaj/
JODE (Java Optimize and Decompile Environment)
Java decompiler with full source code. Supports inner/anonymous classes. Also contains a small, but extensible bytecode obfuscator/optimizer. [Open Source, GPL]
url: jode.sourceforge.net/
JReveal.Org
Online decompiler and obfuscator. Also has a resource directory. [Freeware]
url: www.jreveal.org/
JReversePro
Decompiler/disassembler written entirely in Java. Provides facility to inspect constant pool contents. [Open Source, GPL]
url: jrevpro.sourceforge.net/
Mocha
Hanpeter van Vliet's first Java Decompiler. Orphaned at Java 1.02, so crashes on inner classes. [Freeware]
url: www.brouhaha.com/~eric/computers/mocha.html
NMI's Java Code Viewer
Reconstruct source code from binary Java class files or generate low-level Java byte-code. [Shereware]
url: www.trinnion.com/javacodeviewer/
RIIS: Decompiling Java
Godfrey Nolan's book on writing your own Java decompiler. Early chapters are online in PDF format.
url: www.riis.com/publications.htm
SourceAgain
Java Decompiler for Win95/NT, Unix, web-based trial version from Ahpah Software. [Commercial]
url: www.ahpah.com/product.html
SourceTec Java decompiler
Patch to Mocha which defeats Crema. [Shareware]
url: www.srctec.com/decompiler.htm
WingDis 2.15
Command line Java decompiler. [Commercial]
url: www.wingsoft.com/wingdis.html
