Steam Community :: Garry's Mod
Garry's Mod - Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.You spawn objects and weld them together to create your own contraptions - whether that's a car, a rocket, a catapult or something that doesn't have a name yet -...
garrysmods.org
SGM classic (If this link doesn't work I'll look for a better one steam being weird rn)