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Now that you ask for internal cheats I'm going to mention some that are on the provider list, this is in no shape or form me endorsing or condoning other not-mentioned cheats!
Before purchasing, ALWAYS do your own research like checking out their reviews in the sales thread or provider list and their tbm feedback. (Most of the cheats are external so that gives you a slim choice unless you are willing to give a lesser-known not listed cheat a chance)
I know following are internal:
blackout
unnamedtech
any other provider, feel free to chime in if you're internal