Some of my favourite emulators for making cheats:
FCE Ultra -
Open-Source and available for all popular OS. Runs almost all
games,easy cheat search.
Another cool NES emulator with movie/sound capture,auto IPS
patching,cheat search and much more.
Nescube - Free NES emulator for
mobile and smartphones. Need Java 2ME
- NES Emulator for SonyPlaystation 2
NES Emulator for Apple iPhone users.
Open-Source emulator for Linux,Windows,DOS and MacOS
- Fast emulator with low system requirements,supports most games.
JNes - Great NES emulator from
JaboSoft. It has own cheats database,netplay and movie record.
More NES emulators on The Emulator Zone