I am only aware of 2:
There is DbgHelp, but it's geared more toward the PE file rather than the object file. And Its intended to be used as an API rather than a tool.
the COFF format itself originated on unix http://en.wikipedia.org/wiki/COFF although Microsoft has extended the format somewhat and the unix seems to have abandoned that format in favor of ELF. But you might find some useful tools in the Unix world, for instance this dump tool from SCO http://docsrv.sco.com:507/en/man/html.CP/dump.CP.html
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