The full GTA V source code has been leaked The leak contains GTA V source code and stuff from Bully 2 and GTA VI Leaked in a discord server by a random British guy in the 360 modding community known to get sued by Rockstar multiple times

"Now i am expecting a open source version of gta to arrive soon on linux natively . Tired of playing supertuxcart."

Here is the source. Another one.