High Level Assembler and Toolkit (HLASM) - System/390 assembler toolkit for MVS & VM & VSE (HLASM) including disassembler, by IBM. - http://www.ibm.com/software/awdtools/hlasm/
MELPS7700 Disassembler - By H.Kashima. - http://kaele.com/~kashima/software/melps7700e.html
Open Reverse Code Engineering - An open community site offering a number of services including blogs, forums, download and reference libraries. - http://www.openrce.org
The dcc Decompiler - It decompiles small .exe files from the (i286, DOS) platform to C programs. - http://www.itee.uq.edu.au/~cristina/dcc.html
Reverse Engineering Compiler - Program that tries to make source coden (C) from binary, multiplatform. There are MIPS disassembler too, by Giampiero Caprino. - http://www.backerstreet.com/rec/rec.htm
TRACE32 - Microprocessor Development Tools include multi processor emulators and disassemblers. - http://www.lauterbach.com/
FARGDIS - Fargo Disassembler for TI-92 DOS versioin, by John Grafton. - http://www.ticalc.org/archives/files/fileinfo/4/452.html
Re39 - Interactive Disassembler for Rockwell C29/C39 (C40) code by Lewin A.R.W. Edwards. - http://www.zws.com/products/re39/index.html
AVATAR - A disassembler/patcher/code-explorer for PA-RISC based HP-UX systems, by Allegro Consultants, Inc. - http://www.allegro.com/products/hp9000/avatar.hpux.info.html
DSP5600x - A 5600x disassembler by Miloslaw Smyk. - http://wfmh.org.pl/projects/delfina/
SST Global-Decompilers - Decompilers for IBM midrange systems. - http://www.sstglobal.com/
the bastard disassembler - *NIX disassembler. Written in C on Linux for x86 ELF files; intended to support multiple CPUs, OSes, and file formats. Scriptable. - http://bastard.sourceforge.net/
Misosys Disassembler - Tim Mann's TRS-80 Page includes Misosys Disassembler, aka PRO-DUCE. - http://www.tim-mann.org/trs80.html
This96 - 80196 disassembler by zartoven. - http://www.winsite.com/bin/Info?500000032198
Universal Cross Disassembler - XDASM - DOS based cross-disassembler supports numerous processor types, by Data Sync Engineering. - http://www.datasynceng.com/xdasmdoc.htm
IDA Pro - The multi-processor, multi-OS, interactive disassembler, by DataRescue. - http://www.datarescue.com/
MacNosy - Is a Mac application that disassembles the Macintosh ROM or any 68K or PowerPC codes, by Jasik Designs. - http://www.jasik.com/nosy.html