SketchUp - 3D for Everyone
Klapty - Create and share your virtual tours for free or have them done by a professional photographer. Klapty - The world in 360 °.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
Modsy - Interior Design You Don't Have to Imagine. See your exact room, expertly designed in 3D with actual pieces of furniture from well-known retailers that you can buy on the spot.
FreeCAD - An open-source parametric 3D modeler
Scenics.app - Create high-performing virtual tours, showcase your work, and share anywhere.