A 5600x disassembler by Miloslaw Smyk.
Fargo Disassembler for TI-92 DOS versioin, by John Grafton.
High Level Assembler and Toolkit (HLASM)
System/390 assembler toolkit for MVS and VM and VSE (HLASM) including disassembler, by IBM.
Is a Mac application that disassembles the Macintosh ROM or any 68K or PowerPC codes, by Jasik Designs.
Tim Mann's TRS-80 Page includes Misosys Disassembler, aka PRO-DUCE.
Open Reverse Code Engineering
An open community site offering a number of services including blogs, forums, download and reference libraries.
Reverse Engineering Compiler
Program that tries to make source coden (C) from binary, multiplatform. There are MIPS disassembler too, by Giampiero Caprino.
Microprocessor Development Tools include multi processor emulators and disassemblers.
Universal Cross Disassembler
XDASM - DOS based cross-disassembler supports numerous processor types, by Data Sync Engineering.
the bastard disassembler
*NIX disassembler. Written in C on Linux for x86 ELF files; intended to support multiple CPUs, OSes, and file formats. Scriptable.