spim is a self-contained software simulator for running R2000/R3000 assembly language programs. It reads and can immediately execute files containing assembly language code. spim also provides a debugger and simple set of operating system services. spim provides both a simple, textual interface and a fancier, graphical interface. The package includes complete source code and documentation.
The bastard disassembler is a disassembler written for x86 ELF targets on Linux. Other file formats/CPUs can be 'plugged in'. It has a command-line interface and is meant to be used as a backend or engine. Support for controlling the disassembler via pipes is provided. Note that this disassembler does not rely on libopcodes to do its disassembly. Rather, the 'libi386' plugin is a standard .so that can be reused by other projects.
joeq is a Java 2 (JDK 1.3 and 1.4) compatible virtual machine. It is unique in that it is entirely implemented in Java, leading to greater reliability, portability, maintainability, and efficiency. It is also language-independent, so code from any supported language can be seamlessly compiled, linked, and executed dynamically.
Chump is a table-driven assembler and dissembler with a very fast new architecture input format. Both the assembler and disassembler are created using a single description. It comes with descriptions for ARM, MIPS, Stump, and 6809. It is intended for use as a library compiled with other programs to allow line assembly and disassembly.
The Perl x86 Disassembler is a full x86 disassembler written in Perl, independent of objdump. The Perl script makes use of the opcode tables from libdisasm [derived from the bastard project] and is distributed as part of libdisasm. This is the same script that is included in the Perl-Disassembler-HOWTO; either the HOWTO or the libdisasm distribution will provide the required files [x86disasm.pl and 1386.opcodes.map] and documentation.
Classfile Reader & Writer is a Java package that makes it easy to read and write Java class files. It does not provide any help with displaying the contents of a class file (besides debug output) or disassembe the byte codes, but can read "obfuscated" class files such as those generated by Crema.
The Java Binary Enhancement Tool (JBET) is a general Java program analysis and manipulation tool. Existing class files can be disassembled, eassembled, or edited programmatically through the JBET API. JBET can also be used to create new Java class files from scratch. It uses a convenient internal representation of all the contents of Java binary (.class) files, allowing the user to edit the classes easily, in a structured manner.