Marvin
Removes unnecessary classes and obfuscates applications, applets, and servlets. Supports encryption of string constants. [Freeware
drjava.de
Title: The Marvin Obfuscator
Description: The Marvin Obfuscator prohibits reverse engineering of your Java applications. And it's free
Keywords: java obfuscator obfuscate obfuscation reverse engineering class source code free application decompiler