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