If you do not know, Garys Mod is a sandbox game that doesn’t have any fixed rules and instructions.
Despite there being no rules and aims for the players, this is a very popular game across the world. Developed as a mod for another video game called Half Life 2, GMod spread as a complete game in itself. It has sold millions of copies across the world and made millions of dollars in profit for the developers. If you are using Mac as the OS, you can get GMod download free Mac from here. Enjoy creating things and developing them like a God in this game.
GMod for Mac Update