Unity - The multiplatform game creation tools for everyone.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
BuildBox - Buildbox is a new video game maker that is extremely easy to use.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
Cocos2d-x - Cocos2d-x is an open-source and cross platform open source free 2D game engine for mobile game development known for its speed, stability, and easy of use