Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Unity - The multiplatform game creation tools for everyone.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.