An open-source x64/x32 debugger for windows
Capstone disassembly/disassembler framework
Generic Code-Seeking Diassembler with Fuzzy-Function Analyzer
Assembles M6800 and 6801 assembly language source code. (and Forth)
Open-source disassembler for x86/x64 machine code (New BSD License!)
Japheth's assembler, JWasm
Binary (hexadecimal) editor for Windows