First game engine editor has just arrived on tablets, and is available for download on the Android Market (now known as Google Play) with Apple Store soon to follow.
Esenthel Editor is the app allowing of following functionality: File Browser, Model Editor, World Editor, Code Editor, and many other smaller utilities which can be powered by touch as well as keyboard and mouse if your device supports it.
See it in action here :
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Project website - http://www.esenthel.com/