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Free Disassemblers and Decompilers

RECReverse Engineering Compiler
REC is a portable reverse engineering compiler, or decompiler. It reads an executable file, and attempts to produce a C-like representation of the code and data used to build the executable file.

Borg Disassembler
A disassembler for Win32 PE files

PEDasm
Symbolic disassembler for Win32.

Debuggy
Win32 disassembler and resource extractor.

dasm68.exe
A cross dissassembler that dissassembles 680xx binary code using a PC