I'm not a professional. I used to use SketchUp to work out small plans like a chicken coop or a bathroom, but now it's terribly expensive and I only need one maybe once a year. Are there any free apps for making simple 3D diagrams or renderings? I don't need a million colors, fancy arcs, textures or lighting. Just the ability to make a 3D model and move it around like you used to be able to do with SketchUP.