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.
Marmalade - Platform to author, deploy and manage high performance 2D and 3D games.
Shiva Engine - Shiva Engine is a cross-platform development solution.
Corona SDK - Cross-platform mobile app development.
BuildBox - Buildbox is a new video game maker that is extremely easy to use.