SketchUp - 3D for Everyone
VirtuallyShow.com - VirtuallyShow.com is an online affordable and feature-packed virtual tour service that allows you to create your residential and commercial real estate virtual tours in just a minute.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
EyeSpy360 - EyeSpy360 is a world’s most leading self-service 360 virtual tour software platform that allows you to create a high-quality tour in a few minutes.
FreeCAD - An open-source parametric 3D modeler
Klapty - Create and share your virtual tours for free or have them done by a professional photographer. Klapty - The world in 360 °.