It sounds like you're referring to a Fallout: New Vegas mod called (or a similarly named overhaul), combined with Nexus (the mod site) and Cheat Engine (a memory-editing tool).

Madness Project | Nexus Cheat Engine

It sounds like you're referring to a Fallout: New Vegas mod called (or a similarly named overhaul), combined with Nexus (the mod site) and Cheat Engine (a memory-editing tool).