Unity - The multiplatform game creation tools for everyone.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Godot Engine - Feature-packed 2D and 3D open source game engine.
FreeCAD - An open-source parametric 3D modeler
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.