Antti Karttunen's PDP-11 page: Contains GLAD (Generic Lisp Assembler/Disassembler).
pdpxasm: PDP-11 cross-assembler, cross-linker, and cross-disassembler run under DOS, by Strobe Data Inc.
VMS Disassemblers Package (V00238): By Claus Calle, Andy Pavlin and others .