Unity - The multiplatform game creation tools for everyone.
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.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
CryENGINE - The most powerful game development platform is now available to everyone. Full engine source code.