GameSalad : Game Design Engine
GameSalad is an easy to use game creation engine that you can use to develop games for various platforms and devices including Windows, Mac, iOS, Android etc. GameSalad Creator’s visual, drag & drop interface and complex behavior library provide enough flexibility to game designers. It has an In-App previewer that lets you test your game logic and behavior sets. After developing your game you can publish it via GameSalad’s web publishing system.