The Open On-Chip Debugger
Interactive 6502 Disassembler for Atari binary files on Windows
d7avx + dbgavx - SSE/AVX development/debug helpers for 32bits delphi
M6811 Code-Seeking Disassembler
A machine code manipulation library for Intel 64 and IA-32.
ZiLOG Z80 CPU emulation library
A disassembler and a simulator for the MSP430 CPU
powerpc disassembler/assembler
Java classfile assembler/disassembler and interactive low-level editor
Binary (hexadecimal) editor for Windows