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/
*