Code Generation Library - Bytecode manipulation library used to extend Java classes and implement interfaces at runtime. [Open source, Apache Software License] Byte Code Engineering Library - Implementation of an API for reading, writing, and modifying class files in an object-oriented fashion. Can be used to create (dis)assemblers, (de)compilers, and obfuscators. [Open Source, LGPL] Package gnu.bytecode - Contains classes to generate, read, write, and print Java bytecode (.class) files. Part of the Kawa project. [Open Source, GPL] Barat - Compiler front-end for Java, supports static analysis of programs, parses source code and class files, builds full abstract syntax tree from source code files, enriched with name and type analysis information. [Open Source, BSD License] jclasslib - A Java class file library also contains the popular Java byte code viewer. [Open source, GPL] Trove - Contains a Class File API to simplify the creation (and modification!) of Java class files - high-level methods are provided in order to avoid having to write bytecode directly. [Open Source, BSD-like] ASM - Java bytecode manipulation and analysis framework. Site includes documentation, issue tracker, and download option. [BSD License] ByteML - A Java bytecode/XML intreroperability framework. Converts a .class file to a XML file. [Open source, GPL]