Decompilers and Disassemblers

CafeBabe
Graphical disassembler and editor of Java bytecodes. [Open Source] Note: download at parent page.
http://www.geocities.com/CapeCanaveral/Hall/2334/Programs/cafebabe.html

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]
http://www.bysoft.se/sureshot/cavaj/

ClassCracker
Visual Java decompiler from Mayon Software Research. [Commercial]
http://mayon.actewagl.net.au/index.html

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]
http://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]
http://sourceforge.net/projects/dcompiler

JCavaj
A free Java-based Java Decompiler. It uses Jode as its Java decompiling engine. [Open source, GPL]
http://www.bysoft.se/sureshot/jcavaj/

JODE (Java Optimize and Decompile Environment)
Java decompiler with full source code. Supports inner/anonymous classes. Also includes a small, but extensible bytecode obfuscator/optimizer. [Open Source, GPL]
http://jode.sourceforge.net/

JReversePro
Decompiler/disassembler written entirely in Java. Provides facility to inspect constant pool contents. [Open Source, GPL]
http://jreversepro.blogspot.com

Mocha
Hanpeter van Vliet's first Java Decompiler. Orphaned at Java 1.02, so crashes on inner classes. [Freeware]
http://www.brouhaha.com/~eric/software/mocha/

SourceAgain
Java Decompiler for Win95/NT, Unix, web-based trial version from Ahpah Software. [Commercial]
http://www.ahpah.com/product.html

SourceTec Java Decompiler
Patch to Mocha which defeats Crema. [Shareware]
http://www.srctec.com/product/javadecompiler/