If you've watched streamers on Twitch living out lives as police officers, criminals, or ambulance drivers in Los Santos, you're looking at GTA 5 Roleplay. To join them, you need a tool called FiveM.

Update 13/08/15: Rockstar state that only "individuals involved in [FiveM's] creation" have been banned. See the full statement below. Rockstar have been swinging around the ban-hammer again, this ...