Fast and lightweight x86/x86-64 disassembler and code generation lib
SIMD macro assembler unified for ARM, MIPS, PPC and x86
An assembler for the legendary 6502 processor and it's derivatives
A machine code manipulation library for Intel 64 and IA-32.
Japheth's assembler, JWasm
A simulator for Atmel's 8/16-bit AVR microcontrollers