Godot Engine - Feature-packed 2D and 3D open source game engine.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
HaxeFlixel - Create cross-platform games easier and free. All with one codebase.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Orx - Orx - a portable open source game engine
ZBrush - ZBrush is a digital sculpting and painting software solution.