Utility3 - A screen-resident Z80 disassembler based on an Amstrad CPC128, by Geoff Wearmouth. - http://www.wearmouth.demon.co.uk/ditties.htm
dZ80 - Is a freeware Z80/Z180 disassembler for binary files, such as arcade machine ROMs, Z80-based personal computer snapshots - DOS(source available) and Windows versions, by Mark Incley. - http://www.gaby.de/ftp/pub/cpm/znode51/specials/dz80131.htm