NES - SNES Editors & Programs:
NES - SNES Search/Patch Tool
Download NES-SNES Tool ver 1.1
Also available at RHDN with a full description: NES - SNES Search/Patch Tool
Zombies Ate My Neighbors ROM Editor (SNES).
Download: Zombies Ate My Neighbors Editor ver 1.2 (SNES)
Also available at RHDN with full description: Zombies Ate My Neighbors editor