6502 Cross-Development Languages and Tools
Includes 6502 disassembler references, by Daniel Fandrich .
Acorn Disassembler
Disassembler for Acorn RISC-OS.
Antic Software Archive
Carries Atari disassemblers.
Commodore Programming Utilities
Have 6502 Software Development Kit (with disassembler).
Dan's Atari 5200 Tech Page
VSS is an Atari 5200 Super System emulator for MSDOS, it includes disassembler by Dan Boris.
dis6502
An unix version of 6502 disassembler for the Atari 8 bit machines by Robert Bond.
Distella
Atari 2600 ROM disassembler by Dan Boris and Bob Colbert.
The UK Mirror Service - Acorn Disassemblers
http://www.mirrorservice.org/sites/ftp.uni-stuttgart.de/pub/systems/acorn/riscos/lang/assembler/disa
Collections of Acorn RISC-OS disassemblers.