bddisasm is a fast, lightweight, x86/x64 instruction decoder
Fast and lightweight x86/x86-64 disassembler and code generation lib
Capstone disassembly/disassembler framework
Blazing fast and correct x86/x64 disassembler, assembler, decoder, etc
RetDec is a retargetable machine-code decompiler based on LLVM
Open-source disassembler for x86/x64 machine code (New BSD License!)
Small and easy to learn x86 disassembler
Binary (hexadecimal) editor for Windows