An educational software system of a tiny self-compiling C compiler
RetDec is a retargetable machine-code decompiler based on LLVM
M6811 Code-Seeking Disassembler
Open-source disassembler for x86/x64 machine code (New BSD License!)
A simulator for Atmel's 8/16-bit AVR microcontrollers
A disassembler and a simulator for the MSP430 CPU
Binary (hexadecimal) editor for Windows