Design Camera - Drag and drop 3D mockups
Previewed - Beautiful mockups & graphics for your next app
Vectary - Vectary is a free, online 3D modeling tool and sharing platform.
Craftwork - A collection of User Interface resources made by Craftwork
Isometrica - 3D illustration constructor with 380+ isometric objects
Morflax things - Generate 3D device mockups in a quick and engaging way