Java .class files decompile tools

 Jad (commercial, no fee for noncommercial use, no source code)
http://www.kpdus.com/jad.html

* JADO (Free, GPL, not actively maintained)
http://sourceforge.net/projects/dcompiler

* DJ Java Decompiler ("freeware", no source code)
http://members.fortunecity.com/neshkov/dj.html

* HomeBrew Decompiler (Free, GPL)
http://www.pdr.cx/hbd/

* JODE decompiler and optimizer (Free, GPL)
http://jode.sourceforge.net/

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