Godot Engine - Feature-packed 2D and 3D open source game engine.
Roblox - Reimagining the way people come together.
Unity - The multiplatform game creation tools for everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Project Anarchy - Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.