I looked around for anything I can find relating to GarnetGaming and stumbled upon a couple net messages you can send and abuse to a degree.
Normally these net messages are sent from menus opened up from NPCs, but you can send them regardless if you are near the NPC or not. (However, some other NPC specific net messages do look for the distance, such as weed selling)
These net messages will let you refill your health and armor when called, $1000 for health and $2000 for armor. What I have been doing is making it call this every time my health or armor goes below the maximum to effectively create god-mode for a price (barring one shot weapons).
Health:
Code:
net.Start( 'tupacMedic.performAct' )
net.WriteString( 'health' )
net.SendToServer()
Armor:
Code:
net.Start( 'tupacMedic.performAct' )
net.WriteString( 'armor' )
net.SendToServer()
Not quite the exploits I was hoping for but given that you normally can only do these "purchases" from talking to an NPC that opens the menu, and it can be abused to give paid god mode if you have decent cash on you, I think it's useful. I've been using it for safety if I want to be 90% sure I don't die from someone. Do what you want with these, I can't find any more extreme exploits for Garnet Gaming if there is any.
208.103.169.33:27015 is the ip, though it's not the most ground breaking exploit