Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
CraftStudio - CraftStudio lets you craft games from scratch in real-time over the Internet.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.