m68kdis  
   Disassembler for Motorola M68000 thru M68030 CPUs. Includes full source in C by Christopher G. Phillips.
   http://archiv.leo.org/pub/comp/usenet/comp.sources.misc/m68kdis/

Avocet Big Bang Simulator  
   Avocet's AVS68K, 68xxx Family High Level Simulator includes a debugger, mini-assembler & disassembler.
   http://www.avocetsystems.com/company/techshee/asheets/bbsim.html

Aminet-Dev  
   Directories "asm", "c", "cross", "debug" contain disassembler references, by Aminet, Amiga Software.
   http://ftp.wustl.edu/~aminet/dev/

Dissa  
   An Amiga disassembler by Ramazan. [Archive]
   ftp://de.aminet.net/pub/aminet/misc/emu/dissa.lha