TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Unity - The multiplatform game creation tools for everyone.
Lux Delux - Lux Delux is a game of strategy and domination inspired by the board game Risk.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
ThumbZilla - Awesome thumb stomping and kicking action game.
Corona SDK - Cross-platform mobile app development.