Unity - The multiplatform game creation tools for everyone.
QICI Engine - Full-featured HTML5 game engine with visual interface for building games.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Scroller Game Creator - Create your scroller shooter game
AndEngine - AndEngine is a free android 2D OpenGL game engine.
Flowlab - Flowlab is an online game creator. Make your own games to share with friends.