SIMD macro assembler unified for ARM, MIPS, PPC and x86
RetDec is a retargetable machine-code decompiler based on LLVM
A machine code manipulation library for Intel 64 and IA-32.
Japheth's assembler, JWasm
Assembler, Disassembler, Processor Emulator
Intel assembler syntax for gcc
Binary (hexadecimal) editor for Windows