PE Explorer makes it easy to view, analyze and edit win32 executable files (EXE, DLL, SYS, ActiveX).
It's an interactive, programmable, extendible, multi-processor disassembler.
IDA is a powerful multi-processor disassembler and debugger.
It can convert raw binary files to editable Mnemonics files.
Microchip PIC18 Disassembler is a tool for the PIC18Cxxxx and PIC18F parts only.