JODE (Java Optimize and Decompile Environment) - Can be used to optimize, obfuscate and/or decompile code. [Open Source, GPL] JCloak - Bytecode obfuscator to protect code from reverse engineering. [Commercial] Jshrink - Removes unused code and data then obfuscates symbolic names in class files. [Commercial] Zelix KlassMaster - Java obfuscator with flow obfuscation, string literal encryption, scripting, Ant integration, incremental obfuscation, obfuscated line numbers, J2ME plugin and stack trace translation. Also removes unused classes, fields and methods. [Commercial] jarg - Java Archive Grinder - Shrinks and obfuscates jar files. Runs from the command line or as an Ant task. [Open source, BSD] ProGuard - Shrinks and obfuscates, with template-based configuration. Comes with an Ant task, a J2ME WTK plugin, and a tool to de-obfuscate stack traces. [Open source, GPL] JavaGuard - Obfuscates. Updated version of RetroGuard. Can be run from the command-line or using a GUI. [Open source, GPL] yGuard - Bytecode obfuscator configurable to run through Ant build scripts. [Freeware, core library is open source, LGPL] Semantic Designs Java Obfuscator - Scrambles source code using nonsense names and stripping comments to disable reverse engineering. Works on large sets of files. [Commercial] JBCO: The Java Bytecode Obfuscator - A Bytecode Obfuscator with third-generation control-flow transformations. [Open source] Allatori Java Obfuscator - Performs name and flow obfuscation, string encryption, application size reduction, and provides watermark functionality. Site includes documentation, download option, and FAQ section. [Commercial] Protect Your Java Code - Through Obfuscators and Beyond - Introduction to Java code obfuscation, documenting where it falls short and what can be done about that. DashO Java Obfuscator - Provides obfuscation and optimization. Includes overload induction renaming, control flow obfuscation, string encryption, and watermarking. Site includes documentation, support forum, and evaluation download. [Commercial]