Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Unity - The multiplatform game creation tools for everyone.
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
Godot Engine - Feature-packed 2D and 3D open source game engine.
SketchUp - 3D for Everyone
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.