Blender
https://www.blender.org/
Sketchup
http://www.sketchup.com/
Unity
https://unity3d.com/
TinkerCaD - includes apps
https://www.tinkercad.com/
Blender
https://www.blender.org/
Sketchup
http://www.sketchup.com/
Unity
https://unity3d.com/
TinkerCaD - includes apps
https://www.tinkercad.com/