Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Celestia - Real-time 3D visualization of space
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Stellarium - Stellarium is a free open source planetarium for your computer.
ZBrush - ZBrush is a digital sculpting and painting software solution.