[Jim Donoghue <jim(a)smithy.com>]
  I'm trying to find a Z80 disassembler for Linux.
[...] 
Well, it's not _specifically_ for Linux, but I have a multi-machine
disassembler that includes a Z80 module.
ftp.rodents.montreal.qc.ca:/mouse/disas/src/ contains the source.  I've
never tried to build it under Linux; if you have trouble, drop me a
note off-list and I'll see what I can do.
[Scott Stevens <sastevens(a)earthlink.net>]
  A universal disassembler that is 'Open Source'
would be a cool thing
 to have, though. 
Well, my disassembler is hardly _universal_, but it has modules for a
couple of 6502 derivatives, some variants of the 680x0, MIPS, SPARC,
and x86 families, the VAX, and the Z-80...with the machine-specific
parts relatively well isolated, so that dropping in another one is a
fairly simple task.
As for open source - mine is in the public domain.  You'll have to
decide whether that's open enough for you.
/~\ The ASCII                           der Mouse
\ / Ribbon Campaign
 X  Against HTML               mouse(a)rodents.montreal.qc.ca
/ \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B