Kodu Game Lab - Kodu lets kids create games on the PC and XBox via a simple visual programming language.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Ceilfire - Ceilfire is an online game maker for creating HTML5 games and sharing game assets. Make play and share games directly in your browser! Make Your Own Game!
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Flowlab - Flowlab is an online game creator. Make your own games to share with friends.
ZBrush - ZBrush is a digital sculpting and painting software solution.