Multiplatform Game Engines and sdk for Mobile Game Development

1. Edgelib : 2D and 3D middleware game engine, support for iOS, Android, Windows Phone, Symbian, Mac, Linux, etc.-platform game development. Free.

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2. Emo: mobile gaming framework that leverages the Squirrel scripting language, based on OpenGL ES and OpenAL / OpenSL iOS and Android game development.Open source, free of charge. 

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3. Unreal Development Ki t: is the world’s most renowned authority broadest top game engine.Support for iOS and Android. Free version of Unreal Engine 3, does not contain the source code  . 

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4. JMonkey Engine : a free open-source Java OpenGL-based engine, a scene graph-based, high-performance graphics API, the Java language is a graphics rendering engine.