This is a Sim Settlements Addon made by Ohnno. 

What is Sim Settlements?

Sim Settlements is a simulation game in which you can construct your own town. In this game, you can create and develop your own land, construct various buildings and objects, harvest and produce goods, and fight with other players.

You can also play this game offline, without the Internet, for free.

You can also play with your friends or online, with other players around the world.

You can create a character, and play as that character in the game.

How to play Sim Settlements?

The game is played in a 3D world, which you can freely rotate and zoom.

You can select a construction site and click on the object you want to construct.

You can also select the plot you want to build on and develop it.