Redboard - High-end 3D storyboarding software for animation production workflows.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Storyboarder - Storyboarder makes it easy to visualize a story as fast you can draw stick figures.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Plotagon - This app, Plotagon. is very fun. Creative and lets me express my ideas and all of my desiors!
ZBrush - ZBrush is a digital sculpting and painting software solution.