2500AD Simulator-Debugger: Includes disassemblers for many micro-processors, by Avocet Systems.
6809 Emulation Page: Some disassemblers and debuggers for 6809.
M68HC11 Simulator: Have 68HC11 Disassembler by Rijswijk Institute of Technology.
Tom's Timex Page: Contains two 6805 disassemblers by Tom Johnson.