I've seen and used a lot of interesting tools in game development, and this one really stood out as something strangely useful and unexpected. Using a 2D tileset, the example video sets up a 3D cottage using basic plane manipulation. It's utility may be limited in scope unless your project would benefit from it, but it was extremely cool to see up close. I often have RPG Maker developers want to make the jump to an engine like Unity and bump up to 3D with the same art style their project is known for, and this would be the perfect tool to use to make that happen.